Thalassa is a two-storey residence within the Hidden Mill estate in Pefkochori, Halkidiki. It occupies a private land plot of 249.24 m² and includes a ground floor, first floor, and underground level.

The underground level consists of a storage room, technical room and laundry room, all naturally lit via a cour anglaise. The ground floor features an open-plan living room with kitchen and one bedroom with a full-size bathroom. The first floor includes two additional bedrooms, each with access to spacious balconies, and an additional full-size bathroom.

Outdoor features include a private swimming pool (4.5 × 9 m), a shaded pergola lounge with outdoor kitchen-barbecue area, and three surface parking spaces near the residence entrance.