Kostas is probably the nicest guy in the island and the house we rented was absolutely great. Upon arrival we had a couple of maps and some other treats, which was nice given none of us knew anything about the island.
The house is on top of a hill in an ancient windmill that was transformed into a perfect accommodation for anyone looking for a quiet stay in Santorini.
The rooms are large, cool and clean, with a lot of light. The small swimming pool with a great view is perfect for a relaxed late afternoon - the outdoor is set so you can have great meals under the sky: having breakfast or dinner there is absolutely priceless.
The house is a 10 minute drive from the best beach in Santorini (Perissa) and about 15 minute drive from Thira (the host helped us rent a car).
I would definitely repeat this stay.