Vasiliki's studio is probably one of the best air bnb I've seen. It's very well located a few steps away from Fassolou beach and 5-10 minutes from Faros and the bus stop. The view is amazing.
The house is very clean and quite convenient. It was, for us, a room with a terrace and a small bathroom.
Most of all, Vasiliki and her family are incredibly welcoming and helpful. They offered us a traditional chickpea soup and desert. They helped us a lot especially as to our boat tickets. And they are very nice !
I strongly recommend this air bnb ! It's a wonderful place to stay when you visit Sifnos.