Good choice for DC
We decided to spend a weekend in Washington, D.C. and picked this hotel because of the good rate, location and other people's reviews.
Parking rates are outrageous at $42/night. The valet guys tried to be helpful in pointing us to an alternate cheaper garage in the area, but there was some confusion about it.
There is one garage right around the corner from the hotel ( NW corner of K and 16th ). They charge $25/night, but do not accept credit card payments. We ended up parking in a PMI garage on M street, just west of 17th. The garage is right next to the Avis location. They are open 24 hrs, charge $22/night and accept credit cards.
The check-in experience was quick and easy. The elevators are fast in this location and during our stay, we did not have to wait long for one. We had a corner room, which was pretty spacious. It was very clean and everything seemed in very good shape. There in no refrigerator in the room, but one was brought up after requesting it at the front desk. Being at the end of the hallway and away from elevators, it was quiet. Our room was in a lower floor and not in the executive floors, which during our stay seemed to have plenty of kids.
We had breakfast in the executive lounge in the 10th floor. Normally the lounge is reserved for HHonors Gold and Diamond members, but there seemed to be a lot of people there. The lounge is small and it is hard to find tables. There were only 2 workers there. One that seemed to be just supervising, and the other who was running around cleaning, bringing more food etc. They should have definitely add at least another worker. It was so busy there, I felt bad asking for anything. 
The food was ok. No hot items. They had bread and pastries, hard-boiled eggs, cereal and fruit. Food items were not replenished fast enough and there were constantly empty display plates. There are no snacks or drinks on weekends. After having experienced some great lounges in other Hilton properties, this one was disappointing. A category 7 Hilton hotel should do better than that, or lower its category.
The staff were very nice and friendly.
The hotel is within a short distance from several Metro stops. Businesses seem to close early and there isn't as much open at night around the hotel.
Overall, we enjoyed our experience here, and would probably return again. The hotel has some work to do to uphold its Cat7 status.