If you are looking for the full Washington D.C. experience and want to be close to the action I would highly recommend staying at Amy's. Her home is located in Capital Hill a densely populated area less than 10 minutes from the National Mall. We always felt safe outside even when arriving home late at night. The check-in/check-out process was a breeze and Amy was always available when needed but also kept intrusions to a minimum. There is a whole family living upstairs but we never even heard footsteps.
We arrived by car and used the parking pass made available by the host and were always able to get a parking spot nearby. We were also able to park near downtown D.C. on a residential street for free (with parking pass) and walked to all the attractions. There are also may public transportation options nearby and an Uber ride would be very affordable.
As far as the living quarters are concerned they were exactly as promised. Plenty of room, very cute modern space, full laundry room, great bathroom with whirlpool bath and many other amenities. I would highly recommend this spot and will definitely stay here again if in the D.C.area.