First, let me tell you that the customer service at Book2park.com is absolutely stellar and fast!! I made the mistake of booking the wrong lot and choosing one whose shuttle didn't operate after hours. I realized it last minute day of and shot them an email of my boo boo. Within the hour, they took care of everything and booked me a new lot without me having to whip back out my credit card.. And let me tell you, it pays to be a returning customer! Now to review the lot.. It is a little further out from IAD, but they pick up every thirty minutes and through after hours which really is a plus. Shuttle after midnight was a little late but came within the time frame i was given after the call was made. Hotel staff was super nice and would definitely book again!!