My friend and I had a very pleasant stay at Apostolis Windmill Studios. We spent two nights there at the end of August.
Akis and his mother were very nice and helpful. Akis gave us free rides from/ to the airport, helped us rent an ATV and gave us all the information we need to know about Mykonos. His mother kept our bags in her possession after the checkout to be able to tour Mykonos the last day since our flight was at late afternoon.
As for the studios, the individual apartments are great: Traditional Mykonian white houses that have a panoramic mountain view, Our apartment terrace though had a sea view as well. The windmill, which is a bigger apartment, made the scenery even better.
The apartments are clean and are well equipped. The place is in a quite area that is only 10 mins away by ATV from Mykonos town which is really good.
I am really glad we chose this studio and I am sure you'll be as satisfied as we were.
Cheers!