Agree with other reviewers. Oia is the prettiest village in Santorini and the cave house is the best location from which the view the beautiful caldera. The paths in Oia can get very busy during the day but just a few steps down from the main paths you can get away from the throngs in this gorgeous and peaceful Airbnb apartment. We spent a lot of time just sitting on the private balcony enjoying the view and having fresh bread delivered each morning for breakfast was a treat. It's a view you can never get tired of.
Our small cave house was very comfortable and definitely spacious enough for a couple. It was very clean and serviced each day. Gill and Emily were very helpful, responded quickly if we had any questions and booked airport transfers. We followed some of their suggestions for activities including the cliff top walk from Oia to Fira which was amazing - definitely do this, and the walk to Ammoudi bay - another must do.
Staying at the cave house in Oia was a truly memorable experience. This is the place to stay in Santorini.