This is a great location very close to the main commercial "street" in Oia. The location at the top of the cliff has amazing views and a great antique feel to it. If you are booking it, be aware that there are a lot of steps to go up and down the cliff and that the rooms do not have air conditioning, which could be an issue in the summer heat.
Elena and Vasylis, who work for Maria, were very helpful and got us to The Cave and back out when we needed to depart. Elena can also help in setting up catamaran excursions, tours, etc. Highly recommended!