I stayed here three separate weeks for business and have no complaints whatsoever. Very nice Marriott with large, clean rooms. All of the staff I encountered was very friendly, and helpful. The location is what makes this place great - it is attached to the underground walkway which allows you to go from one end of Crystal City to the other. You can go to many restaurants without having to go outside if it's raining. The Conceirge Lounge had decent options for breakfast, including fresh fruit, and light appetizer and salad for dinner. If I had any one opportunity for improvement it would be that they added wi-fi service to the rooms - which only had a wired internet connection (at $12.95 a day no less). All in all, a nice place to stay that I would not hesitate to go back to.