My wife and I, just spent a couples of days at Marianna's apartment ant we are very happy. The appartment is very clean, comfortable and have all the accommodation you need but the BEST is the location. 3 minutes away from the metro by walk and is really really close from all the main touristic attractions such as the Acropolis, Acropolis museum, Zeus temple, Plaka, Monisteraki, etc....
I will come back to Marianna's apartment any time!