We loved staying at 3Arches. Christos was very helpful and quick to respond. He set up our transfers to and from the ferry port. He also helped arrange a catamaran tour our second day and brought us extra beach towels before we left on the boat. I definitely recommend staying in Oia. It was nice to be so close to the action and then able to escape the midday crowds and heat. The house is adorable, colorful, and well decorated. We had plenty of space - I wish there were more of us and that we stayed longer.