Stahis' place is within walking distance of anything you want to see. Literally minutes to Plaka, Monistiraki and the Acropolis.
It's on a very safe pedestrian street. The apartment was clean and comfortable and all of the air conditioners worked great, as well as the appliances. The two bathrooms were a plus. The small elevator really helped after a day of sightseeing and shopping. The only thing to note is that there is a bar in the courtyard that faces the back of the apartment. Even though you're essentially on the 4th floor, the music goes until 2 or 3 in the morning - something to be aware of if you have small children. Other than that, communication was great and you really can't beat the location.