We stayed here while we visited Washington, DC. It takes around 30 mins (non-rush hour) to get to the national monument. But the room had a kitchenette which was so convenient. We went with another family. We could make sure kids had everything, make tea while waiting for everyone to get ready. Some days we even brought take out and ate at our convenience. The breakfast is absolutely great! We went there a second time -- our family only. We got a smaller suite, but everything else was the same.
My husband also went there by himself when he was flying out of the country. They are very close to the Dulles airport. They have a shuttle to the airport too.