We stayed at Yiannis' place for 2 nights. Yiannis is very kind, friendly and very helpful with the communication as he replies to the messages very quickly.
The place is as wonderful as it looks in the photos. It was also very clean and Yiannis cared for having the fridge and shelves full of food and every kind of stuff that we might need during our stay.
The location is perfect as it is in Monastiraki area, close to many bars and taverns and very close to the beautiful area of Plaka and the Acropolis hill as well.
We would definitely recommend Yiannis' place for both a brief or longer stay and it will certainly be our first priority next time we visit Athens.