Psyiri which is the neighborhood that Konstadinos place is located is literally the best. Very very close to the train station and within walking distance of all the sights to see in Athens.
Konstadinos offers many great local suggestions on places to eat, as well is honest with his guests about prices around the city, advocating on your behalf, making sure you are treated fairly and just.
His complex is safe and secure, he and his sister are very organized in the way they approach air bnb and have literally thought of everything so that you don’t have to and can just enjoy your stay in Athens. I wish I could write improvements but Konstadinos has thought of everything you’ll need while in Athens. For what we paid and what we got, I would highly recommend him!! Excellent excellent host!