Alto Mare is situated in Kamari under the imposing mountain which Ancient Thira sits on. Nearby are restaurants and a well stocked supermarket over the street selling fresh bread, wine, olives, more booze and all the bits you need or have forgotten!
Kamari beach is a 2 min walk away with an array of shops and bars that have sunbeds and good food. The local bus stop is 30 secs away but if you have a hire car there's off road parking too.
The apartment was spotless and spacious. We were 2 families of 3 and everything was provided. If there is 6 of you then you probably need to ask where the water heater switch is, with 2 teenage girls we needed this.
The hosts where marvellous and answered all questions and allowed a late checkout and even provided a cleaner at the half way point.
I would recommend this as a good base for exploring Santorini. Oia is less than 30 mins drive, even in traffic.
Thank you guys!