Overall average
The hotel was clean, and up-to-date. The gym is small but functional. There is a small pool and jacuzzi that I didn't use. 
 Problems are the shuttle is limited 8 am- 12 pm, 5 pm-10:45 pm. It goes to union station. Sometimes it is very efficient in a nice van, one time the van (shared with holiday inn) was crowded and standing room only. (imagine that driving through downtown dc) Staff ranged from indifferent to good. Continental breakfast is ok. There is no room service or on-site restaurant so you have to do take-out. The neighborhood is not great- would not recommend walking too much around esp at night although I felt hotel was perfectly safe. I might be worried if my car was parked in the lot.
 The biggest issue is not the hotel itself but location. It costs around $17-20 in taxi to get from hotel to union station or smithsonian museums. If you don't get shuttle and you go back and forth on day trips with cab, you might as well pay for higher end hotel closer to attractions. The Metro is NOT close enough to use for this hotel. More practically, take shuttle to union station and take metro. 
Don't get swayed by Marriet label, this is a modest hotel.