We stayed at Yannis' place for nearly two months and were very happy with the experience. It is spacious and comfortable, it has a good sized kitchen with the necessary supplies, which allowed us to cook when we wanted. It's a ground floor apartment but it got plenty of light and we were not at all bothered by noise. The location is very good, in the Pagrati neighborhood, which is full of restaurants and cafes -- you can step out the door and find good places to eat -- and it's walkable to the Syntagma and Plaka. I fully recommend it.