I stayed here in Feb while attending a conference at the WEWCC - DC's large convention center. It is located one block from where 395 ends at New York Ave, about a dozen blocks from Union Station (Amtrak), and four short blocks from the convention center. Since I arrived by train, there was no need for car, taxi, or uber.
The B&B is in what NYC would call a brownstone and is attractive from the exterior. Some parking on-site (very reasonable cost for city parking), but ask before assuming. The interior is interestingly more modern than the exterior, but is pleasantly relaxing and quiet. The upper 2 floors have ~ 4 rooms each (mine had a bath), Rooms are huge, clean, comfortable, had some antiques (accent tables), plenty of storage, fridge/microwave/Keurig, writing desk, large closet. Bath was well-appointed, and shower had one heck of a lot of spray heads.
Breakfast was at 8:30, and seemed pretty standard for a B&B...better than hotels, certainly.
I enjoyed the stay, and would return at any time, if my travels brought me to the vicinity.