Magical!
There are no words to describe the experience of staying at Maria's place. Oia is incredibly beautiful and staying in the cave was an essential part of the experience. From the moment of our arrival Maria's helpers made us feel welcome and made sure we were comfortable, helping us with luggage and move-in.
While the cave house is just minutes from the main walk of shops and restaurants in Oia it feels secluded and invites you to sit and gaze at the view of the water and neighboring islands. Everything was very clean and comfortable as well, with all you need to cook.
To sum up, It was very hard to leave. Don't miss it!