I live in the western part of Switzerland, not far from Geneva. I think you've possibly misunderstood what you have been told by your friends - you don't need

I live in the western part of Switzerland, not far from Geneva. I think you've possibly misunderstood what you have been told by your friends - you don't need to show your bank balance to a landlord. However, it is true that you have to apply with a dossier of files as specified by the agency or landlord and you can expect these to contain a copy of your contract (and so your salary) and also a statement from the local debt/claims agency (best English approximation I can think of for "office de poursuites/Betreibungs- und Konkursämtern") attesting to the fact you do not have any outstanding claims against you. It is unlikely as a foreigner that you will. However the essence of what you were told is correct - there is a lot of demand for apartments in Geneva and Zürich. The occupancy rate is well over 99%. It is less a case of searching for the flat you like and applying than applying for many apartments and hoping you are chosen by the landlord.