Kostis is an incredible host. Easily one of, if not the best host I've ever met. He treats you like family. He responded to every question we had in a very timely manner. He also had plenty of recommendations within walking distance from his place.
The place itself is charming, clean, private. The location across the street from the Acropolis Museum and a short walk to the Acropolis itself is hard to beat. Not to mention you can see the Parthenon from the balcony! There's so much to see and do, all within walking distance.
Overall we had the best experience in all of our travels. Kostis was a big reason why.