We had a great visit to Santorini and a wonderful stay at Gemini Cave. It is a very quaint and creative space just a short drive away from Oia, the main attraction in Santorini with its white and blue buildings and beautiful sunsets. The apartment is centrally located, just up the road from Sigalas, a prominent winery. It is certainly walkable to the main area of Oia with the restaurants and views, but is easier if you drive (parking can be difficult to find around sunset.)
Natasa welcomed us from the moment we arrived and set us up with recommendations and bookings for a half-day sunset cruise with Sunset Oia (95 Euros per person) and a 2-tank dive through Atlantis Diving (100 Euros). We rented a car and drove to the Santos Winery, Fira and the black beach on the southeast side of the island.
The jacuzzi was a bit cold with our early June visit, but the beds outside are nice to lay out on and catch some sun. In July and August I'm sure the water in the jacuzzi is perfect, but note that it is not a heated hot tub.
Make sure you try the restaurant right around the corner from the apartment (Natasa can recommend) as well as one or two in Oia to enjoy the beautiful views. Also, be sure to walk to the best viewing locations to see the sunset and the buildings.
Overall, we loved our time at Gemini Cave and found the service, cleanliness and originality of the space to be top notch.