My sister and I were in Athens for 3 nights and I definitely recommend Yota's place! It is near Panormou metro station (which is 3-4 stops away from the center). The place was clean, it had an amazing terrace with a view of Athens. Yota is incredibly kind, caring and helpful.
Also, no need to take a cab, you can get to the airport from her place (and vice versa) and it'll cost you 10€ and take you 35 minutes. If it's your first time in Athens, Yota will take the time to tell you all about the best places and will leave you all the informations written down.
Don't look further, this is the place you need if you visit Athens.