Aris was very helpful and responsive throughout the process. He even helped to arrange a taxi from the port for when we arrived (25 Euros for the two of us with luggage).
Aris was present when we arrived and gave us all the information and help we could want.
The place itself is lovely, with great views, and plenty of space. The pool is nice, but not heated.
The house is about 10 to 15 minutes walking from Oia Center, and right next to a bus stop and also restaurant (Santorini Mou--great atmosphere, ok food).
The only downside to our stay is that they were working on the house next door which took a bit away from the the privacy and serenity that would have otherwise been perfect. This work occurred during the day, and was usually not too obtrusive.
Overall this place is great and I would stay here again, rather then Oia Center as it has more privacy and quiet then the town center has.