The apartment is as pictured: sleek, modern feel, new appliances, including an ultra modern shower with great pressure and hot water, and a washing machine. Some basics were missing, such as extra toilet paper, a hand towel, and a bath mat, but Nestor was very responsive. He is very pleasant and easy to talk with, has a very amusing dog(!) - and speaks excellent English. The walk from the flat to the best sites in Athens is long but doable.
Second, the negative:
In spite of it being ultimately safe (nobody ever bothered us,) the neighborhood is rundown and feels very seedy. Nestor's "greeter" left us waiting for her on the street for twenty minutes, without communicating at all. Very unpleasant, especially after the hearty welcome which we were given everywhere else in Greece. Nestor apologized when he found out but it still made for a disappointing start. The neighborhood is noisy at night: closing the window helps but not completely.
Conclusion: Although the neighborhood leaves something to be desired, it is more affordable than the better appointed neighborhoods in Athens, and should therefore still appeal to budget travelers.