We stopped here one night before our flight home. Wi Fi, boarding pass printing and breakfast were all included in the very reasonable room price, something we didn't find in many other hotels during our stay in the USA. The rooms were fresh and clean and, if we'd had the energy, the swimming pool looked very inviting.
The staff were very helpful and offered us great suggestions for last minute visits to fill in time before take off.
I was surprised to read in other reviews that there were no restaurants close by. There are in fact 3 within walking distance but be warned that Bob Evans is a dry house. If you have a car the Backyard Grill just 5 minutes away does excellent steaks and has a good wine list. Don't be put off by the covered area outside, there is a cosy dining room to the left of the entrance.
All in all this is a perfect location for Dulles Airport .