Stayed here a couple of times and everytime my stays have been pleasant. The hotel is closely located to IAD and runs a shuttle; however, if you intended on driving into DC on a daily basis then you should reconsider. Its perfectly located if will be staying in the Reston/Herndon/Sterling area.
The rooms are spacious and very clean; staff is curteous and facilities are clean. The hotel is located within a strip mall which a number of shops and a theater. Shops stay open until 10 so there are some food choices right below. Otherwise, there's really not much within walking distance.
I would stay here again.