Very nice and accommodating parking location. Quick and easy check-in. Shuttle runs every half hour. I was able to drop my car off early in the AM - before 5 AM (which is why I picked this location). When I returned to Dulles, I gave the hotel a call and a shuttle came and picked me up. Be sure to get on the Courtyard Marriott shuttle, and not the Marriott shuttle - as they both arrive at the same location (2H).