Try to never pay more than a third of your salary on rent, for reasons of pure common sense. I am sure you can take a look at the available options and price ranges in the various areas of Zurich, do your budgeting and decide how much you are willing to pay.
I ended up buying my own apartment, but I used to rent in Zurich. My rule of thumb, if you live alone, don't ever spend more than 2k per month for a one-bedroom apartment, even if that is only the 20% of your salary. You're literally wasting money that you could save. Of course that means you won't be leaving near Bellevue or thereabout...