Mikes place is just perfect!
We traveled with a 2year old.
The apartment is in the very center of Athens, but yet in a quiet street. The metro is 5m away, and all the interesting stuff are very close by walking: the Acropolis, the park, the flea market, restaurants, coffee shops and so on.
Mike is a great host, he waited for us to check-in after midnight, was very helpful with information about Athens, and cared a lot about us during our stay.
I highly recommend on staying at his place.