The apartment is in a nice area of Athens, being close to tourist sites but not directly in the tourist filled areas. The foot of the Acropolis at Monastiraki Square is about 10 minutes walk from the apartment, as is Syntagma Square. There are plenty of nice places to eat around (including a great sandwich shop called Big Mouth opposite the apartment, great for something quick to eat). Basically, the apartment is in a great position for exploring the city.
Romanos & Nancy are great hosts; they were very accommodating to arrival times and gave us local tips on what to see and how to get around. They are also very quick at replying to messages for anything you need.
The apartment itself is a good size for 1-2 people, with a balcony. It was very clean when we arrived and came with a map of the surrounding area, highlighting many spots of interest, restaurants, bars etc.
In short, the apartment and hosts were great and we would be very happy to stay there again!