First of all, it is an epic story, well done CDPR.

The most intence and sad part is going to the abandoned estate to get the rose. In the estate we meet 4 sad character : Iris, the cat, the dog and the caretaker.

Starting form the caretaker, it is an otherworly soul trapped inside a body made of twisted flesh, unlike the cat and dog have some limited freedom, it be forced to do all sort of jobs in the estate, just like a slave. So by killing it, you actually free its soul, send it back to its home world.

The cat and dog are also souls from otherworld who trapped in the Witcher world, I don't think they are real demons, they are just slave who trying to gain their freedom.

Iris definitely still loves Olegierdm, or she wouldn't ask how is her husband. By taking the rose, we are not just free Iris's soul, but the cat and dog as well. So by completed the mission, we free 4 trapped and tormented souls at once.

In the end I choice to help Olegierdm, because he is a tormented soul, too. He still loves his wife and feels guilty about his brother's death, and he keep trying to fix his mistake. Besides, between bandit leader and devil himself, I choice the lesser evil, defeating Master mirror in his own game.

All and all, it is a great story, but I really want some more witcher contracts.

I decided to do a review for HoS as well and since you've already made a thread on the same topic, I might as well put it here.
Maybe more people will add their impressions too.

*spoilers up the whazzzoooo*

Overall Impression - Bad, with a few really Cool bits.

The Good stuff:
Colourful characters
more nice scenery
hideous spiders
More things to discover
More loot to find - Meh because you already have a full set of fully upgraded witcher gear at that point; it's all just extra money.
Upgrades for armour, which differ from the rune system - Good because it's an alternative with some cool benefits. Bad because it replaces the normal runes and require 3 slots to use at all.
The whole mini romance with Shani is sweet and fun.
The whole breakin at the auction gallery was fun and interesting.
The banter with the banker (and others there) who gets you into auction was quite immersive.

The Bad stuff:

1) EVERYTHING is level 35! - The common critters all over the world that are related to HoS in any way are level 35. This includes things you've previously fought which max out at say level 15, like harpies.
This is the same stupid shit that mmos do to extend playtime, which just destroys sense of progression and character power.
It is just a huge waste of time to go through most areas unrelated to the HoS story because you WILL have to fight a bunch of useless enemies, which are now just as tough as you.
You, who is one of the most powerful characters in the entire world of the game... are now just a random guy on par with a single harpy in terms of both damage and toughness.

I really cannot overemphasize how stupid this one is.
ALL normal enemies should've been stuck to within the normal, lower level ranges which their counterparts in the rest of the world are stuck to.
There should never be such a thing as a level 35 drowner or harpy.... only the bosses and unique characters of the expansion should've been such a high level!
The knights of the rose are another example; they should've maxed out at level 20.

2) Getting put into the middle of about 10 enemies at the same time and being expected to fight them.
This is another stupid thing included in the first expansion, which just pisses me off.
Both battles are technically optional.

First is a sidequest where you go to fight the knights of the flaming rose and are FORCED via cutscene to do something batshit stupid... which is walk into the middle of a room full of enemies.
Just like the rest of the creatures in HoS, every one of them are inexplicably just as powerful as the most notable characters in the entire rest of the game world.

The main quest one is truely optional.
However if you choose to fight, you are in the middle of about 8 heavy fighters and a VERY effective mage, who can teleport at will, as well as fling spells constantly.
In fact, this guy is so combat effective, I wonder why others mages and sorceresses such as Triss or Yen aren't anywhere this powerful....?
I can reasonable estimate that a mage like that protected by a couple fighters or a single golem, could reasonably take on an entire army division by themselves and not die!
How did ANY of the mages in the mage hunts even get killed?.... it's not like witch hunters or guardsmen are actually skilled or powerful, nor able to fight with magic, like witchers do.

3) Possession
This is an absolutely revolting and offensive concept and someone stupidly thought this was an acceptable premise for giving a dead guy a good time; No!

A much better option for a heartless guy like von everic was to tell him to make a reasonable wish or you'll cut him to pieces and burry each one in far flung locations so he can't do anything at all!
This actually happens to some weird characters in a few other games, whom you end up bringing back to 'life'.

4) A variety of scripted setups that you are forced into
While some of these situations might happen in the books... ie a 'realistic' take on the world, they make NO sense in the game.
Example: The Toad Prince after battle where you get knocked out by poison and captured.
Anyone who's played the witcher has had their character poisoned over and over and it didn't mean shit all!
You pop a quen and are instantly cured, or use a healing item which counters the poisons hp drain until the poison is gone.

This is before I've even pointed out that EVERY witcher potion is basically a poison of sorts; they are.
Under NO circumstance during the normal course of gameplay could your character ever succumb to poison; it's just ridiculous that it happens after the frog prince.
I might as well mention the perfect timing of those guys arriving too.

5) You have to deal with the devil.
Um no. This entire ending bit is just offensive.
'You can't possibly fight him, you have to deal with him' Um no.
Anything can be hurt; anything can be killed.
Oh and there's always another way; you just have to find it.

6) Overpowered monster bosses.
I don't like using the term overpowered, because a good game makes it so that you can do whatever that boss did after beating it.
However in HoS there are two bosses who make no sense in one way or another; here's why:

Toad Prince
First off is size; this thing is huge, yet moves around faster then any smaller monster.
This is impossible because the bigger something gets, the slower it has to go or it'll break it's own limbs with each movement; even in a world of magic, this is true.
Take a look at the cyclopes and ice giants; they move pretty fast for something so big, but at least give the impression that they are big and ponderous!

The Caretaker
This thing is basically invulnerable, except for scripted pauses it takes when slamming it's weapon into the ground.
The reason it is invulnerable is because it heals the full amount it does in damage, with every single strike.
It's also immune to all stun and charm, while being able to destroy your slow circles; it's very cheaty!

7) Violet Rose Winter Scene
If you've played through the white frost portion of the game, then you know that quen can protect you for a bit from the cold.
Apparently whoever designed this last outdoor scene thought that it was acceptable to cheat on that and just make the painted world blizzard INSTANTLY destroy your quen shield.
I find this insulting and another little piece that is crap because if I've powered up quen, I should be able to resist a blizzard almost indefinitely by the normal game rules.

I shall add that I enjoyed the beginning quests a LOT more then the ending ones.