Honestly, Kostis was an amazing host. He provided us with breakfast supplies and bottled water for the morning. He gave us directions to everywhere we wanted to go and recommended a great restaurant. The location can't be beat. The apartment is beautiful and was great for our group (4 adults and 2 babies (age 3 & 4 months)).
The biggest thing about Kostis is that he really went out of our way to be a good host, not just for his place, but for Athens. He went above and beyond in helping us find our car rental place by coming with us and negotiating with them when we had an issue with the vehicle.
Highly recommended.