Yay:
a schedule that was kept. Horses out at x time. In at y. Feed grain at a. Hay is at a b and c times. Stalls get cleaned at h time. Horses are watered every x hours.
Of course there is some flexibility but having a schedule that is generally kept makes me so very happy. It also makes it easier to plan things (ride time - stay out of the way of the tractor in the aisle whilst they clean stalls, example).
Attentive staff. My horse was turned out every day by the person who was also my instructor. When something was wrong she addressed it immediately and contacted me. He has lost a shoe. He is lame I suggest you call the vet. There is a scrape it is not serious I put corona on it.
Management that maintains facilities (and communicates big projects ahead of time). Gonna overhaul the arena footing and it won’t be good to ride on for several days? Advanced notice please! Likewise, keeping up on fencing, footing, pest control.
Under promise and over deliver, basically. Do not talk about what you want to do or what your plans are. Lay out what you offer. Do it well.
Agree with the above that feeding and bedding tend to be areas of contention. Facilities that have hay nets are AWESOME and make me SO HAPPY. Likewise, feed hay on a reasonable schedule please. Not just twice a day 6 hours apart (10am/3pm).