The Klados studio was super, and it is situated in a really pretty and quiet beach in Sifnos (40m to the beach).
Georgia our host was very nice and she prepared us a lots of greek specialities and food; we really appreciated that!
I obviously recommend the place.
The only negative thing I can say is that Cherronissos (the bay of the apartment) is a little far from the other places of Serifos.