Absolutely incredible. Hands down, the most incredible accommodation I have ever stayed in.
We spent one night in Dimitri's place, and it was a once in a life time experience. This is THE spot if you want to experience the world's most famous sunset (as you will see by the people lining up early all around the cave house to claim their spot), but you will have a perfect private upstairs balcony to watch the gorgeousness unfold from. But even beyond the sunset views, this place was simply outstanding. Gorgeous interior, perfectly designed, totally spacious, perfect location -- with hands down the best views of the sea from it's many beautiful blue windows. Quite frankly, Oia was a bit too touristy for me (though totally worth it to experience for 24 hours), so I mostly just wanted to stay inside the cave house and read with all the windows wide open and the breeze from the sea wafting over me. I mean, it was complete heaven, and I still think about it everyday. And everything everyone is saying about Dimitris is absolutely true -- he might be the nicest person I've ever met and the most helpful. He's a perfect host.
In all, if you are looking at this place, BOOK IT. Do not miss out. It wasn't cheap, but it was 100% worth it, and I will probably fantasize about going back til the end of time!