We really enjoyed our stay at Little Olive Tree. Efi was super helpful and provided amazing hospitality. The location is perfect if you want to be close to everything but not stay right in the middle of tourist city, which we greatly preferred. You can quickly walk to restaurants and shops on the path that runs from Oia to Fira. The path is directly across the street.
Also, the washing machine does work. We used it a couple of times during our stay.