One day after coming back from Giannis' place in Athens all i can say is that its perfect! Giannis is super sweet and helpful host, ready to help his guests about everything. Communication was above excellent, clear and quick. Apartment clean and smells beautiful, its close to tram and bus stops but also to all main buildings in the center like the Acropolis, Monastiraki, Plaka etc.
I would always recommend Giannis as a host and his apartment as a place to stay while in Athens.