The apartment lies in the middle of Kastro, so beautiful and calm! Very charming apartment, small but clever built. We were a family of four and it fitted us perfectly. Kastro has some nice restaurants, and a beach close by (pebble beach, us adult liked it but the kids wasn’t as optimistic about it). It is a good idea to rent a car when arriving at the port, since the busses don’t run too frequently, and there is more cars available at the port compared to Apollonia (?) And there is a lot of really nice beaches and towns to explore at Sifnos! Could definitely come back!