I recommend that he buy The Guild, I'm sure he'll learn all about the banking system of Sweden from it.

This sounds like the Native American loan company called Western Sky :-(

1000 percents interest rate!

Because the fee is calculated based on the amount you originally took out, no matter how much you currently owe.

So, for example, for a 12-month loan of 120000 kr, the fee might be 300 kr/month (all numbers off the top of my head). Each month, you pay back 10300, of which 10000 is the loan repayment and 300 is the 3% fee. Once you have paid back 80000+fees and owe just 40000 kr, the fee is still 300 kr/month (1200 total remaining overhead), while the regular bank might offer a loan at 6% interest for a 0.06/12*4*40000 = 800+ total overhead (at 6% interest, I am too lazy to calculate precise annuities).

(The above presupposes you have enough point credit not to keep contractually obligatory savings. Otherwise, the math is trickier, and I have some urgent java bugs to squash, but it's doable.)

The above only applies if the fee is actually waived. If it isn't, it hurts you to repay earlier (you end up paying the same amount of raw kr sooner), so don't.
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Whatever you do, don't "invest" in precious metals to prepare for the coming hyperinflation or something. There's only one time when they are actually an investment, and that is during hyperinflation when goldbugs are selling them literally for peanuts, because peanuts are edible.