Where do I start with this fantastic experience? Let's deal with the apartment first:
SUPER centrally located! Very clean and spacious and in a safe, secure location. Having 2 bedrooms and bathrooms was great since we were 2 couples. The kitchen was equipped very generously including food in the fridge and everything you would need for breakfast. Kostis also included a bottle of wine to welcome us. The rooftop garden view was incredible (with the Acropolis being the centerpiece). We explored everything on foot including the Acropolis, Temple of Zeus, Olympic stadium area, Plaka etc. We got everything we needed to do in Athens out of the way and we never had to walk more than 20 minutes to do it. And I don't mean 20 minutes of walking followed by some public transit...I mean we WALKED TO EVERY SITE IN 20 MINUTES!
As for our host, Kostis...I can't say enough nice things about him. He was extremely easy to contact and he followed up with us almost daily to make sure we had everything we needed. He arranged airport transport for us (for a very reasonable fee) and made our comings and goings very easy. He took the time when we checked in to highlight the local attractions and give us our bearings. I can honestly say that as amazing as the apartment was, Kostis was the reason we got the most out of our visit to Athens. I HIGHLY recommend both Kostis and his place for your Athens vacation. You will not regret it!