Nostos Apartments is an excellent place to stay on Santorini and a very good value compared to other places in Oia. The manager, Stehpanos, always seemed to be available and accommodating. His staff is excellent and the breakfast is generous. Our apartment was quite spacious with a fantastic view looking across the caldera. Everything was very clean and well kept.
The only drawback was access to the location which required going down quite a few stone stairs. A staff member does meet you at the top and takes care of your bags.
If you need a car, Stephanos will arrange for it and you can pick it up and drop it off in Oia, rather than the airport. This is a benefit if you are arriving or leaving by ferry.More