This hotel is located in the suburb area of Washington DC. It's about 45 min to 1 hour away from DC, but it's close to the Dulles Airport and the Udvar Haze Air Space Museum. You do need a car to get around if you stay there and want to go anywhere else.
The hotel is very well maintained and the room size is good. The staff in this hotel is very friendly and helpful. We had one of the nicest check in experience. The breakfast is very good. A lot of different variety. The downside is that it is pricey. If you are the Marriott Gold Members, you get the breakfast for free which is really a good perk.