We went down there and were told we would have to pay a deposit up front (can't remember how much but it was a few hundred francs) and for that they would search properties for us and let us know if anything came up. The money you paid up front would come off your deposit for the apartment you got and I guess if you found one with someone else you would get it back.

We weren't too sure about it and didn't take it any further - we couldn't find any trustworthy reviews and weren't willing to part with the money upfront.