Stayed at the Comfort Inn University Center the night before visiting DC with my family. Near I-66 into town, so traveling into DC on Saturday was very convenient. (Travel on 66 during weekdays maybe different, so check.) We were given a large two double bed room with kitchen. Comfortable and clean. The kids enjoyed the pool and the value for price is very good.
Staff was very helpful and friendly, were easy to deal with, and offered great suggestions when asked.
They do host group tours, but not a problem for average traveler. I even recognized the property from a trip I took to DC with my students. Hotel has two towers, seemed like the groups were in the other tower from us, and groups had a separate breakfast area