My friends and I had a great time at Katerina's place. We were very happy with how friendly Emmy and Katerina were, as well as how useful they were at check-in. Emmy arranged a transfer for us upon arrival, which was very helpful considering it's a bit difficult to get to the place on your first try. She provided a very extensive amount of useful tips and recommendations for staying in Santorini. The cave is expectedly a bit damp inside (the walls, the floor), but there was a heater and a dehumidifier to make up for that. We had everything we needed to feel comfortable during our stay. I would definitely recommend Katerina's place to get a feel for the Greek traditional life, while still being centrally located to the more populated spots on the island.