Need to know
Twenty, all with a sea view.
Noon. Earliest check-in, 2.30pm. Both are flexible, subject to availability.
Double rooms from $602.80 (€538), excluding tax at 13 per cent.
Rate includes a Mediterranean buffet breakfast with made-to-order omelettes.
The Psychas family, who set about restoring these ancient caves in the Sixties, once traded wine with Odessa; don't leave without sampling a selection of Santorini finest vintages.
Closing 30 October 2017.
At the hotel
Spa, steam room, sauna, gym, outdoor Jacuzzi, free WiFi throughout. In rooms: speakers, minibar, kettle, Rituals toiletries. The Perivolas Suite, New Perivolas Suite and Deluxe Suite with Pool have a private steam room and pool, two Deluxe Suites have a private outdoor Jacuzzi.
Our favourite rooms
The cave-carved rooms are bright and breezy, with whitewashed walls, smooth vaulted ceilings and clever skylights that let in plenty of light. Splashes of fuschia and lilac echo the bougainvillea dotted around the grounds. The Lifestyle Studio makes a perfect little bolthole with big windows looking out to sea and a downstairs bathroom. Suite 15 (a Deluxe Suite) has a big, secluded outdoor terrace. Two of the Deluxe Suites have their own Jacuzzi. The Perivolas Suite is a true rock-star retreat, with its steam room, indoor hot tub big enough for ten, and a private pool extending out from a cave to a wow-worthy terrace.
The unheated infinity pool is all curves and startling Aegean views – a knockout splash of bright blue against black volcanic rock that's graced the cover of many a magazine. Claim a poolside lounger for front-row seats to Oia's famed sunsets, far from the selfie-loving crowds.
When you tire of watching the graceful ballet of ships across the bay, retreat to the 60sq m spa, carved right into the cliffside. The steam room, sauna, massaging jet showers and outdoor hot tub make short work of travel-weary limbs; for total indulgence, try a holistic massage, detoxing body wrap or sea-lavender-infused facial. There's even a range of anti-fatigue eye masks for the seriously jet-lagged. Luxurious Rituals products are used, and the therapist is in high demand, so it's best to book a week in advance. A super-size gym has everything for your cardio, core-strengthening and weight-training needs. Pilates and yoga sessions are held here too (for an additional charge), and there's a stash of mats and a pilates reformer machine.
Bring a pair of Havaianas: the terraces' black volcanic stone can get hot in the sun.
This is a haven for grown-ups – no under-16s allowed.