I've never been to one, but I can think of several things that would make it to my liking.
1. A very organized communicator in charge, with experience and knowledge of the venue
2. Friday afternoon-Sunday afternoon
3. Comfy tables and chairs
4. An on-site cook (I wouldn't go if I had to cook or haul more than snacks)
5. Multiple irons, ironing boards, tables
6. Work on your own thing at your own pace
7. My own bedroom and bathroom
8. Scenic views or small-town feel
9. 12 or fewer people (more than that would overwhelm me)
10. A quilt shop nearby , just in case
11. Plenty of electrical outlets
12. Wine, chocolate, personal massage therapist at my shoulders when I snap my fingers.