Three words: book this apartment!
We went through a long process trying to pick out what islands to visit on our trip to Greece, and how charming Yiannis's apartment looked was one of the factors that drew us to Syros. We were not disappointed in the apartment or the island- both are marvelous!
I honestly have never felt as home at an airbnb, waking up each morning, making coffee and watching the sunrise above Hermoplis from my perch a few blocks down from the apartment.
The kitchen is small but quite usable (we made several large meals), and the location makes for easy access to both the town and the country side. The bed is comfortable, and the water heater allows for comfortably long and very warm showers (something we've struggled to find in some other locations in Greece).
Yiannis himself was extremely responsive and helpful, not only with the smallest question or issue we might have in the apartment, but with great advice about local hikes and wine specific to our interests.
Personally, I can't wait to have the excuse to visit again