Charalambos Sfaellos served as the director of the Technical Service of the Greek National Tourism Organisation from 1950 to 1958. Under his leadership, the design and construction program for the Xenia hotel network across Greece was organized and implemented. This program became a landmark in Greek post-war architecture, playing a pivotal role in establishing the modern architectural idiom throughout the country. The Xenia in Kastoria, also known as Xenia A΄ or Hotel du Lac, was completed in 1955 and marked the first GNTO project to embody the new vision for tourist accommodation in Greece. It was constructed on a plot of land granted by the Municipality of Kastoria on Dexameni Hill (Koule), offering a panoramic view of the lake Orestiada. This A-class hotel featured 25 rooms and 49 beds and quickly became a model for subsequent public and private hotel projects due to its success. Its architecture harmonised with the local heritage, incorporating traditional elements such as stone, tiled roofs, and balconies reminiscent of loggias. Today, the hotel belongs to the Ministry of Culture, and plans for its restoration are underway. Once restored, it is expected to become part of the Byzantine Museum of the city.