We spent three nights in Konstantinos apartment, it was like living at home away from home, the apartment was cosy, clean and had a character. Its in the middle of the old town Thiseio, close to all restaurants, markets, the metro and 10 mins walk to Acropolis. Even though we didnt get to meet Konstantinos but he always made sure that we had everything we needed. We are definitely staying there if we are ever in Athens again:)