The apartment we stayed in was studio 1 complete with kitchenette and terrace. It was absolutely perfect. Really quiet with stunning views of the Aegean which is a jaw dropper at anytime of the day. The apartment was lovely and clean and got cleaned every day with clean towels. Anna was lovely and picked us up and dropped us off at the airport. She was on hand if we needed anything and once brought us fresh fruit from their trees.
The apartment is not actually in a windmill which I didn't understand until I got there. They are studios and apartments surrounding the Apostolis windmill. But no matter, it's gorgeous.
It's a 20 min walk to a lovely beach with a restaurant called Yialo-Yialo serving some of the best food I've eaten and the most amazingly friendly service. From that beach (Plato gialos) you can walk to another couple of lovely hippy beaches.
A regular bus service takes you from that Plato gialos to Mykonos town and the bus stop is 5 mins away from the apartment outside a lovely little taverna and shop/deli.
I would definitely recommend. And such a great price! It won't disappoint.