Hello All!
I am wondering if for an European it is possible to rent a room in an apartment to share, without being resident in Switzerland.
The purpose is to have always here an available room after travelling a lot to other Countries. 
Actually the house is provided by an agency and the others who live in this apartment have the regular contract, living and working here. 
To do legally all the things, I think that the name it should be showed in the contract. 
But, is it necessary to go to announce it also to the Kreisburo? 
Does it imply to get a special permit/visa? 
What are the ways and the consequences to rent a room for such situation? 

Thank you!