6* for location. Walk to the Acropolis and the museum and lots of small restaurants and stores. Bus and Metro are around the corner, too, as is downtown Hertz/Avis and other rental places. Mini market open until midnight, so even on a late arrival you can shop (or let the hosts fill your fridge). They arranged our airport pickup, too.
The place worked well for our family of 5 (two adults children, one teenager). Kids in one room, parents in the other. The place is a traditional European apartment with an awesome old style elevator. Very charming.