Mario is a wonderful host, very communicative, friendly and very quick to respond. His place has wonderful high ceilings, personal decor (which makes it seem more like home) and best of all for Washington D.C. a dedicated parking spot behind the unit. We were able to walk to the Smithsonian museums (under 2 miles) and restaurants (14th street was under a mile) easily. The beds were comfortable and the rooms large. The rain shower heads were luxurious!
The only downside of the location is that it is a tad noisy on a busy street, with the additional downside of some type of construction that was going on very close to the unit. Mario thoughtfully provided a white noise machine, but unfortunately it wasn't able to coverup all the traffic. The last night we were there, we could hear loud footsteps from the upstairs unit pretty much all night long until about 4:30 am. Such is life and not something the host can fully control.