What are the options for registering an address in Austria?

My friend has a problem in Austria. Due to construction work, you must leave your apartment as soon as possible.

My question is, what are your options? He is looking for something cheap (up to 300 euros), because he stays there only a few days a month.

Is it possible to register an address in some type of hotel / boarding house / motel? I investigated this, but I could not find anything conclusive.