We stayed at the Fairfield Inn near the Dulles Airport in September. The service was excellent - check in fast and easy. We had driven for about 7 hours and were tired. The clerk was very pleasant and assisted us by making some suggestions for places to eat. The shuttle service picked up our son at the airport and brought him to the hotel while letting us know that he had arrived at Dulles.
After dinner, my son and I wanted to walk after traveling all day. The area was well lit and off the main street well enough that we were comfortable with walking for over an hour after dark. The only thing that would improve our stay would be for there to be more signs directing us into the hotel. It is about two blocks off the main street and we missed the turn.