We stayed in Villa Erifili for 4 nights. The place was exactly as described. It's a new building, and spacious for up to 3 people if needed. Everything was provided for by the ever-ready crew.
When we arrived, the hosts came to pick us up from the Oia bus stop, which was then a 5-minute drive down to their side of the island. It's about 2km away from Oia town, facing the sea. Did we mention it was facing the sea? The gorgeous blue Aegean, where you can actually see both sunrise and sunset from your location? I thought we did.
Xristos, Ioannis and Anna were extremely helpful in giving us information on what to do and where to go, and to accommodate our needs whenever we had any. Breakfast was provided every morning we were there, and each meal was a great, local selection.
Our suggestion is that you should rent a car when you stay here, because it may be a long walk to Oia if you decide to do so. Take the car, drive along the coastal road and do visit the entire island, something you'll find hard-pressed to do when relying on the not-so-punctual local buses. And in one of the evenings, drive back to the villa, and enjoy a private sunset view from the beach just across the road. You won't regret it.
We had a fabulous time here, and won't hesitate to visit again if there is an opportunity.