This Doubletree is in an ideal location in southeast Loudoun County, very near to Washington-Dulles International Airport (IAD). The sixth floor is reserved for HH Diamond members. It has a nice business/breakfast/cocktail area right off the elevator so the folks on the sixth floor don't have to travel downstairs for much of anything once they check in. The breakfast is complimentary on this floor.
The rooms are standard DT: nicely furnished, decent beds, minifridge, etc. The restaurant downstairs is unusual in that the food is very good for a non-resort hotel. I've eaten several dinners there over the past twelve months and it has never disappointed. The staff go out of their way to accommodate your needs and are always helpful. The only negative is that there is much parking behind the hotel. Unfortunately, there is no entrance on the back so you have to lug your stuff all the way around to the front.
The location is close to Herndon, which has a full complement of independent restaurants, not the usual chains that are located right around the hotel.
An overall very nice DT that I will continue to frequent.