I chose this hotel for a 6 night stay over Thanksgiving based on the price (avg nightly rate less than $90/night), location, and TA reviews. I was not disappointed. We stayed in a superior queen room which was spacious and overlooked the pool (I had requested a room on an upper floor overlooking the pool when I booked my reservation directly with the hotel and we were accommodated). Check-in and check-out were quick and easy. All hotel staff we encountered were very friendly and helpful.
The in room facilities were all as expected - nice flat screen TV, ample drawer and closet space, decent sized bathroom, etc... The water bottles given in the evening with the turn down service was a nice touch. We used the coffee making equipment in the room each morning which proved to be very convenient for us. The room itself was very clean and the hotel common areas (elevators, lobbies, reception) were all up to that standard as well.
We really liked the location being within a couple of blocks of the metro station and within walking distance of the White House (15 min) and National Mall (20 min). On our departure day we opted to take a cab to Reagan for our flight home and the hotel had one for us within minutes.
Overall, I would not hesitate to recommend the Washington Plaza and would stay there again on future trips. As a side note, I would also recommend visiting DC over the Thanksgiving holiday as we felt the tourist areas were largely uncrowded and the weather proved to be great - much warmer than expected and great sightseeing weather. Also, hotel rates seemed to be a lot lower than other periods.