Very good apartment in a very good location. Walking distance from everything that is interesting in Athens. Dimitris was very nice and helpful - he gave us recommendations of places around the apartment.
The only thing that we didn't like are the church bells that started ringing every morning at 6 AM for every half an hour. We are not used to church bells sounds on the morning so it was a little bit of a nuisance for us.
The overall experience at Dimitris' apartment was VERY GOOD.