Do you pay each week or each month for Swiss appartment? How much would a nice one cost?

Normaly monthly with a 3 month rent deposit/guarantee to pay up front, nice appartement, depends where,how big, etc (You know, same as anywhere else, Canada included) but around Chf 2'500 to Chf 7'000.- month

You pay by the month normally.

And a really nice one will cost you exactly 7,900 per month.
However, your mileage may vary.