Mark is a very friendly host who means well. Unfortunately, the stay started off rocky when I arrived and the room was dirty, no sheets on the bed, and no comforters around. There had been a miscommunication with Mark and someone else so I don’t think it’s anyone in particular fault, but it made for a cold couple nights.
The location is great. Many great restaurants and cafes in the area.
My wife and I stayed a couple nights at a holiday inn near the Airbnb when she visited that cost 105 dollars a night. I think the value of Marks place is considerably less than a hotel for ~25 dollars more per night. Sure, if you are interning in DC for three months and you are okay with not having all the amenities then Marks place is great. If you are in DC just for a a week or two, I would consider staying at a hotel in the area. I think you will have the best bang for your buck.