I spent about a week here for a conference. The location is convenient, with the metro stop right downstairs and easy access to Pentagon City Mall. The rooms were somewhat dated but comfortable.
The service here was amazing, though, and I was repeatedly impressed. The food was amazingly delicious and far, far better than I have come to expect at a conference!
I found this a good stay for business, but probably wouldn't find the cost worth it for a personal vacation.