According to the contract, you are bound by various notice periods, unless your contract is for a fixed term.
Room/Studio
Agreement type A: one month notice on July 31st, August 31st, January 31st
Agreement typ B: one month notice for the end of any month
At our studentlodge sites Tscharnergut, Bümpliz Nord, Bern-Bolligen and WankdorfCity prepared forms to resign are available.
Apartment
Three month notice with signature