My 8 night stay in the windmill house was lovely. The house is split over 3 levels - The top 2 levels are bedrooms (no doors) and the bottom is the kitchen, dining and bathroom. There was 4 adults in our house and we all fit comfortably.
The location is slightly out from everything however we hired quad bikes and found our way around fine. There is a store just up the road and a walkable distance, the rest is driving distance. it is located in a nice quiet area.
The owners and staff of Apostlis were very attentive and we can not thank them enough for making our stay comfortable and also driving us to the airport to leave Mykonos at 4am.