I found this hotel quite by accident during the aftermath of the June storm that knocked out power to more than a million homes in Metro DC, including mine, in 100+F heat. I arrived sight unseen after calling the Hilton 800 number. Very comfortable stay. Extremely friendly and helpful staff. The location is excellent for Dulles, and for "stay, park and fly" travelers who want to save money on airport parking.
Excellent decor, well-maintained. Great hot self-serve breakfast.
The only potential negative is that the best access is via a toll road from eastern Washington and environs (or if you can use the free Dulles Airport Access road if you have "business" to conduct there on the airport grounds); otherwise, it's a circuitous toll-avoidance route to get from DC or other areas.
Nice savings for AAA and AARP members, too.