Family owned/ran air bnb (they live next door) - you have a good sized apartment and outdoor area (as well as use of the roof terrace next door). The family are very welcoming and ensure your stay is good.
The apartment itself is dated, though in my opinion, very well priced for the location ... after all, you are not in Athens to see the inside of your room!
For how close you are to everything in plaka it is very quiet and allows for a good night sleep.
You are a 5 min walk to Acropolis museum and entrance to the Acropolis site. 10 minutes in the other direction you are in the heart of the city with all the restaurants and bars. Immediately at the end of the lane is Plaka - lots of shops, ice cream parlours and restaurants. Perfect location and would stay here again.