I can't fault this apartment at all - definitely stay here if you're visiting Athens!
Nasos was a wonderful host and very helpful. He arranged for us to get a transfer from the airport from a lovely driver who text me recommendations of good places to eat. Nasos provided lots of detailed information so the check in process was really smooth. He even provided us with a list recommendations for places to visit, eat and drink. The apartment itself is spacious, spotlessly clean and has all the facilities you'd need. The balcony is a lovely place to enjoy a morning coffee and pastry.
I can't fault the location! The building itself was secure and safe, situated in an area with lots of bars and restaurants right on your doorstep. You're just a couple of minutes walk from the Acropolis, Plaka district and many other sites. We were able to walk absolutely everywhere and didn't need to use public transport or taxis.
I can't recommend this place highly enough. Thank you Nasos!