I spent literally hours researching where to stay on this notoriously expensive island but held off from making a booking as nothing seemed to tick all the boxes - that is, until I adjusted my dates visiting Mykonos and Michalis' place became available! Then, booking his place became one of those no-brainers. His place is spacious, and in the old town - right in the middle of the action but just far enough removed from the main thoroughfares that you get some peace and quiet.
As is the case w all places inside the old town, cars cannot drive in, so be prepared to do some walking with your suitcases. But communication was excellent and Michalis was always super-quick to respond - and his mum was so sweet to meet at the taxi stand and help with luggage and guidance to and from the apartment. So kind!
I suggest letting them help you book the transfers, because the taxi driver will call ahead and co-ordinate for you. It was 20 Euros paid to the driver each way from the port arriving, and the airport departing.
The location is fantastic - you are a 5 minute walk from both Little Venice and the windmills. Shops of every kind are right outside your doorstep.
Air conditioning units were both in the main room and the bedroom - this is appreciated because in some other places in Greece, they tend to be only located in the bedroom area.
The coffee machine (Nespresso) with a few starter pods was really appreciated. There's a big fridge to hold all your supplies. The shower is modern. The space is super clean and although the decor is a bit retro it's really cute and comfortable. Lots of room. There isn't a private balcony space (other than the upper stairs landing area) so keep that in mind if you are wanting one - although the entire old town is your balcony so it's not a drawback in my opinion.
In sum, this is a super clean, comfortable, and spacious place in the best location in old town Mykonos. You'll be well taken care of here as I can't say highly enough how much I appreciate the fast communication with the hosts. :)