Since this is OT, I'll try to keep it quick.
Stunning locations, great architects, use of local materials, spacious and spotless accomodations, sense of place, high staff to guest ratio, know your name and preferences, excellent and often invisible service, usually local staff, genuinely friendly, ever-present GM, open line of communication before and after stay with a feeling of "relationship", activities are culturally rich, personalized, private and get you out amongst the locals. I might think of more later...