The house and the room is kept very clean. Heather contacted me a few days before my arrival to let me know how to get there and left a very thoughtful note about house rules and tips getting around the neighborhood. The location is close enough to the center of the city you can walk within 30 minutes to union station and onto the capital.
But I would not suggest walking at night beyond the national mall area.
Unfortunately I didn't get to meet my hosts during the short two-day stay, but I enjoyed the stay and the city.