Hyatt House Sterling/Dulles Airport-North

That's a relatively recent property, so it's in pretty good shape. The windows open a little, which lets you get some fresh air into the room.

I think I have gotten jipped on the "best available" rule before...when I booked a "guest room" they didn't give me the larger room even when it showed available on the website. But it was a perfectly good bed so I didn't mind so much.

Unfortunately, they don't have a park-and-fly, last I checked. But that was over a year ago, so might be worth calling.