George's place is great, recently refreshed with a lot of taste. The location is great because it's in a very calm neighborhood which allows you to avoid the noise of the city, but at the same time at walkable distance (10 min) of the very center or appolonia.
And George is a delightful host, so friendly, communicative and helpful.
It was a great pleasure staying there for my 5th time in Sifnos and I will definitely go there again.
I highly recommend this place !