Amazing.
First, the Seralia house is fantastic! It is cosy and well furnished, located in a beautiful place next to the lovely village of Kastro. You can literally open your door, walk 10 meters and jump in the sea. The house also has a wonderful rooftop to enjoy breakfast or dinner with a nice view on the Seralia bay, with a typical blue-roofed Cycladic church.
Finally Kwstas is a really kind and friendly host. He helped us to get to the house from Appolonia, offered us some wine when we arrived and had many other kind attentions.
We hope to come back soon! It is the best place to stay in Sifnos for us.