The appartment is very clean and nice with beatiful flowers ! Megalochori is a very nice village with art shops (we recommand you SunBeam, greek hangmade creations !) and restaurants. We were very closed to a local bus stop, so we could go to the beach and in Fira in 15 min. We reserved a car just for 2 days to reach places where you can't go by bus (sunset at Lighthouse was amasing !)
Antonia also speaks very well French. She can arrange the transport for you between her place and the airport.
We enjoyed our trip and find that people in Santorini are realy welcoming et smiling.