Thera/Fira houses are all about two things: the view and the location. In this regard, this property shines. The view is, of course, spectacular, overlooking the Caldera. Somehow, the pictures don't show it. I think the owner/manager (the wonderful Konstantina) needs to update the marketing material. We talked about it with other guests.
We could actually compare because we were a group of 10 and rented two houses with Caldera view at the same time. Both had wonderful views, but this one was also the more convenient location. The reason is that it sits at the start of the town and it is very close to the best (Sklavenitis) supermarket and ample parking. I don't like hauling groceries up and down narrow pathways and we were there for 5 days, so I opted for a car to explore Santorini.
Bonus: it is not as noisy as staying a few blocks closer to the bars --without really being far from them. Everything is a 5-10 min in Thera.
Extra Bonus: the restaurant across has some very nice setting and music, that you enjoy for free as you're watching the sunset and after that --really soft and nice.
Otherwise, the apt was everything you'd expect. The wifi and air-conditioning works, the beds are comfortable (I have a problem with my back, so I am quite sensitive to that) and it is very spacious.