Konstantinos is a great and very welcoming guy and you will definitely enjoy his flat. Locationwise it was the best spot we had so far in Athens. You can walk to all sightseeing spots within 5-15min. Despite being in the center of one of the coolest neighborhoods it is a quiet place with a super relaxing balcony offering nice views on the Akropolis and a nice little church. There are many good places to eat or have a coffee just around the corner as well.