We stayed one night before an early morning airport pick-up. The hotel is only a 10 minute ride to Dulles, and offers free shuttle service as well. The hotel was very nice, very clean, and very quiet considering its proximity to Dulles. The room was the typical SHS room-bed area, sitting area, large flat screen TV(could use a few more channels), micro/refrig, sink. Nice bathroom, good water pressure.
As others have said, there really isn't anywhere to eat nearby, so factor that in if you don't have a car.
The only negative.... Something happened to the indoor pool/whirlpool a few days before we arrived, so it was unexpectedly closed(was looking forward to a soak in the whirlpool). To the hotels credit, when I asked about it, I was offered a ride down the street to their sister hotel, the Hampton, to use theirs. Didn't take them up on it, but the offer was a nice touch.
Hotels in and around Dulles/DC are very pricy, especially during the week, so it wasn't any great bargain staying on a Wednesday. However, I would stay again if needing to be near Dulles