First of all: I had an awesome time in Athens and in Pano's flat!
The apartment is perfectly located, clean and very well equipped, I can highly recommend it for a short term stay. I was always out during the day and came home to sleep and sometimes used the smart TV to chill.
I have to note that the apartment can be a bit dark during Autumn/Winter (the time when I stayed there) because it's souterrain and you cannot open all the windows in the bedrooms as they are facing to the pedestrian street. So if you want to spend lots of time in the apartment (to work or do other things) I would only recommend it during summer. Then you also can take advantage of the super nice courtyard.
The host was really helpful and I had no problems. Also really liked the city map that has been provided.