Incredible view - wonderful to sit in the hot tub overlooking that view, which I imagine is enviable to the people passing by. Host provided a bottle of wine, which was thoughtful. The place was rebuilt in 2010 and renovated in 2015, and it is well-built to withstand strong winds which we did get some while we were there. It is also surprisingly sound resistant, which is important as there are lots of people passing by it at all times of day and night, and a church next door that rang its bells loudly once at 7 am. I kind of liked hearing the chanting/singing during their services that we heard one evening and morning (we stayed 4 nights). The deck area is elevated above the church and surrounding buildings a little which helps some with privacy but not completely, although it did feel pretty safe as the building itself is like a little mini fortress with a locking gate which you need to prevent people from coming up on the deck.
What you need to be aware of is that this was an engineering feat to put 2 bedrooms and 2 baths, a living space and a kitchen in this cylindrical building. I am glad we stayed here because it was a unique experience but I would not stay a second time merely because it really is pretty small footprint for the living areas (and my fiance and I are not tall people), and the 3 levels it requires also requires very steep stairs. With handrails only on one side, this made going up and down them for any reason seem like a monumental task sometimes. The upstairs bath toilet, sink and shower were somewhat ingeniously enclosed together in a closable glass "closet" but one was required to sit on the toilet somewhat askew as a result. If you are expecting to stay here and have gourmet meals you may need to reconsider as the kitchen amenities are very sparse (didn't even have salt) and again, very small space. They decided to add a decorative vessel (above counter) sink in the kitchen also which is horribly impractical for washing the dishes or even using it for any kitchen function for that matter. Instead, I would suggest eating at the restaurant practically next door La Maison which offers fine dining and we were very pleasantly surprised to find had very good food and exceptional service (and we are from Portland, OR and are big time foodies).
The entire place was well ventilated and the A/C worked quietly and marvelously so I feel that the temperature could be excellently maintained so you could remain very comfortable from that perspective. Didn't use the downstairs bedroom but upstairs bed was quite comfy, and bedding was also nice and soft, not papery or stiff like some hotels/condos. Really appreciated having a clothes washer although we had to lay clothes on the bed to dry as there weren't a lot of options for that. Maria, the person who assisted us with check-in and other details, was extraordinarily helpful and responsive, and even at one point escorted us without our asking somewhere to help make sure we got there properly.
Overall again, the view does not get much better - it is incredible and on a non-windy night you could spend all night outside gazing at the beautiful night lights of Santorini. One should stay here if you want unique accomodations that are solid, quiet and comfortable at night, and well-run, just be aware of some of the downfalls which every accomodation will have their own.