The location of the apartment is excellent- just a few-minute walk from Syntagma Square. Plaka is just practically around the corner. Next door there are lots of restaurants/bars, and a very good bakery. At night, particularly weekends, some of these places can be loud. However, with all the window closed, you'll be alright (with aircon in summer).
Though we did not get to see Maria, she was very kind to let us have an early check in, and let us store our luggages in the basement during our island trips.
Christina- Maria's friend- helped us through what-is-where in the apartment. The third-floor apartment could be reached either by stairs, or a very small lift. The apartment itself is spacious, comfortable, very new, with essential amenities, a functional kitchen, and two bathrooms- very convenient for three to four people.
We do love being here, will definitely ask to come back.