Know what you're getting - Caveat Emptor!
Hotel is in dire need of renovation: Interior design, while not appealing, is not as much the issue as is the poor condition. Badly stained carpeting, scratched furniture, 24" TV from the '70s, and yellow lights in the bathroom are some of the property issues.
Front desk personnel have been surly in all exposures (3 total). Restaurant staff is pleasant and provides good service. 
Wi-Fi is unreliable and slow when available. If Wi-Fi is important, L'Enfant is not your destination. I asked about it at the front desk and was told this system and service (as of 7/18/12) was new and intended to improve the old. Whatever... it's still not good.
Location is close to the airport, next to a Metro station, and within walking distance (unless you're not used to city walk distances) to many tourist spots. The promenade mall is for local business workers, occupied mainly by fast food lunch restaurants and very few shops that all close when business hours are over. There is not a selection of nice restaurants for dinner within walking distance.
I stayed here because my work is directly across the street, but if it weren't for that, I would not return until substantial changes are made.