Nihi costs upward of $2,000 a night and what you get for it is a private 2.5km beach with almost nobody else on it, horses that walk into the ocean with you, and a spa experience built around a trek to open-air treatment bales above the water. Families who spend a full week keep saying the same practical thing: there's enough on property (padel, deep-sea fishing, a turtle hatchery, a chocolate factory for the kids) that boredom never sets in, even without leaving the grounds. The Spa Safari is the one activity nobody skips, and it's the kind of thing that's genuinely hard to replicate anywhere else.
The honest catch is getting there. Only budget domestic airlines fly Bali to Sumba, and delays and cancellations are common enough that one couple's departure got pushed three days with no seats to spare. Book flights through Nihi rather than independently, because the staff can actually intervene when things go sideways, and they can't help you if you didn't. Villas vary a lot too: some have full air conditioning and indoor bathrooms, others are open-air with weaker AC, so ask specifically about your villa before you book rather than trusting the category name alone. One guest paying $2,200 a night for a surf villa found the outdoor bathroom and slow butler communication genuinely disappointing for the price, even as most other stays that same season came back raving.
Four nights is the real minimum given the travel involved, five is better, and three will leave you feeling like you paid a lot for a long trip to get there and back. This is for people who want a real beach, real horses, and a spa day unlike anything else on their list, not for anyone chasing the polish of a five-star hotel in a city center.