I stayed here for a week and from the moment I walked in the door I was greeted with the best customer service I've received from a hotel in just about any city. I even tweeted about it multiple times during my stay (Marriot International responded a few times!). The room was an awesome size complete with kitchen (and corkscrew!), sitting area, separate sink/vanity area which is probably great for more than one person staying in the room. It's pet friendly and the bed was very comfortable. I had a view of the Capital building, Jefferson Memorial, and Washington Monument and could see 4th of July fireworks from my window. In an effort to be more social for the holiday I left the room to watch them from the front of the hotel. To my surprise they were handing out popcorn, mini flags, and glow in the dark necklaces!
There was ice cold water in the lobby all day that they infused with fresh fruit. It was different each day--I can't decide which I liked better, the kiwi or the cucumber. The free breakfast had plenty of hot and cold choices. They also had an evening social on the weeknights but because of my schedule I didn't get to any. The pool area and workout room was also very good, smaller pool area but sufficient. The hotel is directly facing the Pentagon, walking distance to Pentagon City mall, close to a Super Target and movie theater, 30 seconds to 395 (which takes you everywhere in northern VA and DC). I parked on the street but one of the days drove around in the garage, it seemed pretty tight (I drive a compact car) this would have been a downside for me if I used it. I ended up parking on the street the whole week which was much easier because I was in and out all day every day.
Two highlights of my stay---after a very long day toward the end of the week it was after midnight and I went to the lobby for snacks. There was a lot to choose from but I mostly just wanted wine. After a funny conversation with Mike, the front desk agent, about how they can't sell wine after midnight I decided to get ice cream. Everything was grossly over priced (standard for hotels) but I was so desparate I decided to suck it up and pay $7 for a pint of Haggen Daaz. Wouldn't you know it, Mike said the ice cream was on him! The other highlight was at checking out, one of the managers went through the trouble of faxing a request to my bank while I was standing there to release the authorization hold immediately from my card...my bank usually holds it for up to two weeks after I check out. By ther time my car was loaded up, the money was available in my bank.
Downsides: Extremely expensive lobby snacks; very long wait for elevators 80% of the time