The Hyatt house in Herndon is a surprisingly lovely hotel that's conveniently located about 20 minutes outside Washington DC. The staff in the reception area were friendly and helpful.
I was there for a conference and found the meeting space and accommodations to be great. Again, management was courteous and made sure all our needs were met. The room was clean, spacious, and well equipped for the day.
The bathrooms were immaculate as well.
If I'm ever in the area and need a place to stay, this would be my top pick.