I stayed here for one night after arriving at IAD late at night. There is a free shuttle to/from the hotel; you have to call for pickup. The time between the call and the pickup was about 10-15 minutes; the hotel is less than 10 minutes drive from the airport, so it is fairly convenient.
The hotel itself is pretty typical for this class of hotel. The rooms are clean and large, though somewhat dark. Amenities are average (coffee, fridge, basic toiletries, etc.). The staff are cheerful and helpful.
The location is somewhat isolated, and really only convenient for the airport. The shuttle does NOT run to the metro, which is somewhat disappointing.
Complimentary breakfast is provided (waffles, cereal, eggs, breakfast meats, etc.), as is complimentary wireless internet. Wireless speeds were okay, but not great.
Overall, a reasonable place for an overnight while transiting through IAD, but nothing spectacular.