We stayed in Georgios' stylish cave house for two nights. It's located in Messaria, which is about 10 mins bus to Fira and 15 mins bus to Kamari beach. It's kinda handy. And we were able to see both touristic towns and local towns in Santorini, which was nice and authentic experience. Although we didn't meet Georgios, he was quite helpful about recommendations and negotiating. His colleague Domilitus (?) is very nice and helpful. We chatted a lot about Santorini life in the past and now, also about its tourism booming development. The cave house is huge for my family and we loved sitting on the roof watching stars at night. The house stays cool all the time. It's an absolutely unique experience. We will definitely recommend this place to people who look for authentic staying.