When I first read all the positive reviews of Vasiliki's place I got a bit sceptical and thought that they might be a bit exaggerated, but when me and my girlfriend came to the studio we soon discovered that they were not exaggerated at all. Both Vasiliki and her mother were as warm and kind as the reviews said, and they helped us with lots of different things - for example we got a ride back and forth from the port to the studio, they borrowed us diver's masks, we even got a traditional Sifnos soup, etc etc. Even though we got all this help and free stuff (which was just a great bonus for us) I wouldn't have been disappointed if we didn't get it, it still would have been worth the stay.
As a recommendation for future stays I can recommend to rent a car or a scooter. Me and my girlfriend only travelled around for a day by bus, which was alright, but if you want to see all of Sifnos you should rent a vehicle of some kind.