Konstantinos is a great host! Although we didnt meet in person during our stay in Athens, he gave us perfect instructions how to get to the apartment. He even helped us out with organizing an airport shuttle.
The apartment was clean and cute aswell as well located to all the attractions (about 15 minutes-walk to plaka-district and acropolis). And: Koukaki offers some cool bars and restaurants nearby, too!
I recommend it 100 % and will definitely come back again!