Giannis's place is one of the best places you can stay in Oia. Despite staying for only a day, we had an amazing time at this place. Everything was way better than we had anticipated from the pictures. The plunge pools (both inside and outside) are a treat. We were welcomed by Dana and Dimitris who helped us check in and also carried our luggage all the way to the cave house. They also helped us get familiar with the neighborhood and what are the things we could do. If we end up visiting Santorini again, I will surely reserve one of his cave houses again. Overall, I would STRONGLY recommend his place to any future travelers.