Stayed a month. Had a blast! Catherine and Lucas are super hosts. They live upstairs and are always available and super friendly. The place was recently remodelled (complete makeover really). Very chic. High end appliances, LG room heater/ac with remote, modern shower, concrete counter center island with seating.
The neighborhood is wonderful too - the H-street corridor. Has a free Street car that runs up and down H. Lots of bars and restaurant. My last night there I ate at Le Grenier, a wonderful low-key French place less than two blocks from the apartment. Transportation is easy - take the Street Car to Union Station to catch the metro. Plenty of on-street parking in that neighborhood if you prefer to drive.
I spent a total of 5 months in DC for work, changing airbnb locations once a month to learn different neighborhoods. This place was by far my favorite.