Hi @crypto.piotr,
We probably have the lowest interests worldwide. At the moment I have to pay to keep my money on my bank accounts... (negative interests). So mortgages are indeed very cheap in CHF. Mine is 1% p.a. at the moment so I can't complain :-).

I believe as long as our central bank tries at all costs to keep CHF pegged to Euro there is no big risk for you.

I wish you a happy new year !

Regards,
Achim