We had an amazing stay at Michael's place. It is superbly well located, just a few minutes by foot from the Acropolis and the Hill of the Muses.
The apartment was impeccably clean, and one can see the Parthenon from the rooftop terrace while having dinner.
Simply put, this is one of the best spots in Athens. We will surely come back.
As for Michael, he was very friendly and helpful and his girlfriend even walked a couple of blocks looking for two confused-looked tourists dragging their suitcases in a circle after their GPS failed.