We really enjoyed our stay at Yiannis place! Very nicely located (close to the Center with most of the sights, restaurants etc, also close, to the national garden, Plaka etc), easy and super fast communication, he cared about us during our stay and also was flexible with check in/out.
Perfect location especially if you stay in the city during the day and need the apartment mainly for sleeping: In this case it doesn't matter that there are no WiFi and not much natural light inside. Not too quiet as it is close to a busy street.