Camp Kathryn is excellent! Great spot, isolated and quiet! Small distance from all of the places you want to be in Asheville. Great for large groups and very well priced. Kathryn is an incredible host with great communication and very responsive.
The only thing is that the drive up the mountain to the house can be a bit scary the first time. Single road with just enough width to fit one car, and has no guard rails on the side of the road.