Stayed here in April for two 1-night stays. They offer a convenient hotel shuttle to-and-from Dulles (which you can also daisy-chain with a shuttle from Dulles to the Udvar-Hazy Air Museum). The rooms were very Westin-like and well appointed overall; they were pristinely clean. The front desk staff was extremely friendly. I didn't get a room upgrade (I'm only SPG Gold), but I was in a nice room on the 7th floor; I've read that the 8th (top) floor is for SPG Plat/Suites but doesn't have any executive lounge. There is tons of parking. The WiFi was free and had decent speed. And they welcomed me on my first stay there with a nice sliced fruit platter and sparkling water set up in the room: very nice touch!