Comfortable Accommodations Hidden Gem - Sifnos, Kastro offers a one-bedroom apartment in Kastron, Greece. The property features a bathroom and a fully equipped kitchen. Convenient Location Located 34 mi from Milos Island National Airport, the apartment is a 7-minute walk from Seralia Beach. Chrisopigi Monastery is 6.8 mi away. Guest Favorites Guests appreciate the convenient location and the friendly host. Highly rated for its excellent service.