The location was excellent, two blocks from the Potomac Metro stop, with frequent trains (about $2.25) to the central mall area and museums. Neighborhood was fine; everyone we passed on the street said hello (doesn't happen in Boston, so that was pleasant!). Large grocery store a block away (go left after leaving house, and left again at Potomac Av).
Re the footsteps above that some have mentioned: we were gone all day every day, but did hear a few footsteps starting about 7:30am and a few as late as 12:30am, but not enough to bother us, and one of us is noise-sensitive. Never heard voices.
The operation of the digital front door lock was clearly explained ahead of time, so easy to use. Hosts were very responsive to questions before our arrival. There are two areas for sleeping, a sitting room with TV and couch (can use air mattress if you want, but we just used the couch), and bedroom.