There are many guest houses in and around Chadaocun (Chadao gu cheng). This is one I stayed in for one night in September and three nights in October, 2010. They have about five private rooms with bathrooms and one dormitory-style room with four beds and a bathroom. There are two computers in the lobby which all guests are free to use at no extra charge.
The service and food were excellent.
The Great Wall Courtyard is located at 40°21'41.42"N 115°59'34.54"E.
Courtyard
Courtyard
Courtyard
Courtyard
Courtyard
Dormitory room
Private room
Private room
Private room
Private room
Private room
Private room
Private room
Private room
Private bathroom
Private bathroom
Great Wall wine
Tasty food