On a perfectly, quiet street in a great neighborhood, this is a wonderful refuge that I, sadly, could only stay for a night. Everything is sparkling clean, well-thought through and the bed is seductively comfortable. Mt. Pleasant is a quick walk and the H4 will get you back to DC proper for touristy, business stuff.
The only drawback is the lack of natural light as it's a back basement room ... but if you've got a little hobbit in you, you'll feel right and cozy at home.