I really enjoyed the stay at Johns place. The room was like described, super clean and the location is just perfect in Mykonos town, close to the old port. There was also a room service with cleaning and fresh towels every day.
John is super friendly and came up with lots of suggestions, where to eat, drink etc. He runs a souvenir shop close to the guest house, so he is available almost all day for your questions or just a little small talk.
Highly recommended and would come back anytime.