Excellent location, central but quiet. Acropolis and the wonderful Acropolis Museum are an easy ten minutes walk. There are plenty of restaurants just a few minutes' stroll away. Filopappou Hill, a largely overseen but beautiful park-type area, with the best views of the Acropolis, are just up the road: this is also a good route for heading to the Acropolis largely traffic free.
The apartment itself is not big, but has everything one or two people need. There's a sofa bed should that be required. Attentive hosts. Highly recommended!