We were the very first Airbnb guests at George's place. The communication with George worked excellently, he was very quick and promt. He was also kind enough to pick us up from the port of Kamares (and he also gave us a lift back when we were leaving the island for Sérifos) and he made us feel that we were more like friends visiting him. During our stay we were granted full privacy but he was there whenever we needed him.
The house is complex of three separate apartments. The Airbnb apartment is the oldest, George is living in the bigger apartment and the third one is currently bein built for the family use. In the Airbnb apartment there is a fully equipped kitchen, an adequate bathroom (there's even a washing machine) and room for four persons. There is no AC in the apartment but there is a fan on the ceiling in one of the rooms. The Wi-fi works perfectly. The nicest way to get to and from the centre of Apollonía is along a nice alleyway (just climb the few steps from the door and through the white little gate and turn right) which will lead to the very center of Sifnos. If you arrive by car there is a free communal parking just next to George place.
We felt very welcome at George´s place, and had a good time on Sifnos once again. Our favorite beach is Vathi. A quiet one, but with all the services one could desire for a perfect beach day. The public bus transportation on Sifnos is very efficient. It costs 1,80€ for a one way ticket. The buses are usually on time and go from early morning until late in the evening. If you need to shop for groceries, go to Exampela (up the hill around 500 metres from Apollonía) supermarket and you will find most of what you might need, if you are lucky. The small shops in Apollonía have a very limited assortment.
George was a perfect host and he knows a LOT about Sifnos. You should use his expertise if you are interested in Sífnos.