Anna-Maria, I think the issue is that you're a student and that you don't have an income, rather than being a foreigner.
Certainly, I needed a financial guarantor for renting a property when I was a student in GB (many, many years ago!).
I haven't been asked for one for the property we are about to rent here in CH because we can provide proof of sufficient monthly salary to cover the payments.
If the problem is that you have a guarantor, but that that person does not reside in CH, then I'm sure that it's not a legal requirement, just a stipulation by the landlord. In which case, you should just offer sufficient evidence that the guarantor will cover your payments.
None of those required documents will guarantee to pay the debt when the rental is not paid. I can understand the agency asking for a guarantor, because they are not allowed to ask for more than 3 months deposit. Any tenant can abscond without paying the last month rent, and also leave a lot of damage!
But you can sign up to an insurance, Swiss Caution, however, it will release the need for 3 months rent as a deposit against damages, but I don't think it covers unpaid rental, you can join at any Swiss Post Office https://www.swisscaution.ch/en
Any tenant can abscond without paying the last month rent, and also leave a lot of damage!
this sadly, and it happens far too often- hence the need for a garantor or 3 months rental. Daughter has just had to pay 3 months in advance + deposit for a nice flat in the UK- despite both her and her partner being British and both having great jobs with high salaries.
Just an update from my struggles. The guarantor was indeed needed because even though they thought my salary is good enough, I have a probation period of three months on my contract. They asked for her residence permit, attestation des poursuites, and her employment contract.
However, when I brought the paperwork to the agency they said they didn't want the originals - just the copies.
The other agency that had asked for all these was happy with a copy of my guarantor's residence permit.