This place was very clean and super convenient to SFO, which is just what I needed after a late arrival. Bedroom #4 is on the lower level/basement. The door to the main hallway of the house locks, and then you go down a set of stairs to the bedroom and private bath. Other reviewers have said that you can hear people moving around upstairs, which is true, but it wasn’t a problem for me. The common spaces were clean and beautiful!