We could also look at the Lazy Lizard Hostel. They have cabins, like many of the campgrounds do, but they also have group houses that can be rented, for example the "Watermelon House" is $280/night and has 8 bedrooms.

"We are neither a fancy bed and breakfast nor an impersonal motel, just a clean comfortable, friendly environment where your group can be alone, all together in one place, and not spend a lot of money. We have provided television, and laundry facilities."

http://www.lazylizardhostel.com/index.php