We had a wonderful time in Santorini and Alexandros’ house is really beautiful and in a really quiet place (house is in Porì, in the windmills area) far from the chaos and tourists. Anyway, we recommend to have a personal vehicle when arriving, otherwise is really difficult/impossible to get to the apartment or to move from there by foot (on our first day we had to call for a taxi to get us to Fira where we rented a motorbike).
Alexandros was not in Santorini during our stay, but he is super responsive on AirBnB chat and he gave us clear indications to reach the apartment. We only had a miscommunication problem on the last day for the check-out, since he had some connection problems and he was not able to reply to us in the morning, but everything at the end was good and we recommend the location for a lovely and peaceful stay in Santorini