Firstly, do you actually have a permit to work here? I ask because you say "getting Work Permit" in the thread title which suggests you haven't had one since you arrived here.
Secondly, if you do have a permit, beware that you can only be out of the country for a maximum of 6 months before your permit becomes invalid, assuming you have a B permit. The limit is only 3 months with an L. So you're cutting it close being half in and half out of the country.
Thirdly, easiest if you have a permit, is to rent a room via www.wgzimmer.ch