Its not just a place to spend the night over. You can enjoy your time, sitting on the couch, reading or relaxing as well as work on the huge desk. You can easily share our kitchen as well as bathroom with my lovely (Hidden by Airbnb) (2).
Please use everything as if you were at home. So I presuppose that you pay the same respect to my (and my ) possessions as you do to yours.
Furthermore its important to be not too noisy and be quiet (especially music) after 10 pm. We have small kids living underneath and they need their sleep (as well as their parents ;) ).