I would definitely recommend this place to you. Great location, 4 minutes by walk to Acropoli. Nearby all you need including great restaurants and markets. Could not think of a better place for spending times in Athens !
About apartment - very quiet, safe neighbourhood and in my opinion just chic! Balcony is arranged in a way that you'd just want to spend time there in the morning and whenever you came back to apartment to refill energy.
Definitely great place to stay !