This hotel, our luxury room, and the reception staff were excellent and what you would expect from an expensive, luxury hotel (good tour options suggested, transfers arranged, etc). The room was spacious and very comfortable. Bed comfy. The breakfast - delivered to our balcony each morning, was delicious (there was too much of it!). There is no onsite restaurant. The staff was efficient but not overly friendly. The bar and pool area were wonderful annd relaxing annd offered gorgeous views. Our private hot tub was appreciated on the hot days (when it seemed cooler) and on cooler mornings (when it seemed warmer). The view incredible. A single bottle of water was provided on day 1. For the price of the hotel there should have been one provided daily as tap water is undrinkable. Towels were replaced daily (even when we hung them for reuse) so not a super eco friendly hotel. Tons of steps which some older folks seemed to struggle with (no elevator).
Imerovigli is a great spot to stay- walkable to Thira but not as busy and overrun with tourists like Thira. We loved our stay and would happily return BUT our sense was that all the hotels in Santorini with a caldera view (which is nearly all the hotels in Santorini!) were a variation of the same. A hotel with a pool and patio area is an absolute must, and the rest is just a question of luxury wants and how much money you want to spend.