Constantinos' apartment was perfect for our short stay in Athens. The location was amazing, just a short walk to the city centre and the Acropolis. The apartment was also spotless with a comfortable bed and great AC. Constantinos was a great host and was there to greet us with the keys even though we arrived late to check in.
The only downside to this apartment was that one of the windows did not close all the way and unfortunately we heard the hustle and bustle of the busy street all night and early morning.
Besides that I would definitely recommend staying at one of Constantinos apartments. I would 100% book again next time I am passing though Athens.