This is a bit of a hidden gem, which I found by accident. I'd say that the positive reviews here mirror my experience. Arrived tired and jet lagged on a Sunday and was immediately made to feel at home in the small lounge just off the lobby area. Being wood paneled with a low ceiling and comfortable chairs it has a "club" feel and is a great place to chill with a drink or a light meal.
Woke up in the middle of the night dehydrated from the flight, went and asked at 1am where I could get some water - two bottles magically appeared: no charge.
The rooms are, as others said, smallish, but elegant and comfortable. If I am staying in DC, this is where it will be.