Service and location are tops
Stayed at this hotel with my two sons from Friday through Tuesday. Bellmen, housekeeping, and front desk (Ben) were all very helpful and friendly. 
The hotel is normally pricey but I was able to get a fantastic rate, which allowed me to stay. The staff place flavored water (made with fresh pineaple, strawberry, cantaloupe) in the lobby daily which was refreshing after walking the mall and monuments.
I've read complaints about the elevators but I liked them. You press your floor number "outside" of the bank of elevators and the electronic board indicates which elevator will service you (A, B, C, D, E or F). You board the elevator designated for you and it takes you to your floor. Simple.
The beds were not the most comfortable...I'd rate them as average.
The Starbucks closes early but the restaurant/bar was open late. I'm not a drinker but the atmosphere seemed nice. We did order takeout plates on two nights and the food was good and price was reasonable ($11.99 for a dozen of hot wings).
Location is great: 2 blocks from the White House; 3 blocks to the Mall and America History Museum). Of course, to see all of the major monuments, museums, etc. you're going to have to walk a lot BUT there's no need to take the Metro. Also, it's less than a 20 minute Metro ride from National Airport (I beleieve 8 stops on the Blue Line).
There are not a lot of eating establishments in the immediate area of the hotel but, China Town (7th and F St) is a short walk and offers everything from Chinese food to Hooters, Ruby Tuesday, Mexican, Seafood, American, Donuts, etc.
Nice indoor pool although not big. Could get a little crowded with young kids. The execise facility is nice and big. It includes showers, sauna, several treadmills, a couple of bikes and stairclimbers, several achine weights and a few dumbells. There are fresh apples and cold towels offered.
If I can ever find a good rate again, I will definitely stay here.