Maria's apartment is absolutely fantastic! We stayed there in May for 2 nights to catch some of Athens while en route to the Islands. Maria offered Danilo's help to gather us from the airport which was a lifesaver as our flight had several delays from Heathrow. Was nice to have a private lift at a fair rate straight to the apartment and also back to catch our next flight south.
The apartment comes fully furnished; if you're planning to have some of your meals there. A supermarket with much of what you'll need is located just a few blocks from the apartment. We were travelling with our 4mo old and had requested a crib which was very helpful for us. If you're travelling with a little one make sure to bring some white noise as it can be a little noisy from time to time as the acoustics given the materials of the building lend to some noise travel but nothing at all to be concerned about unless the sleep of your kid(s) (who is still a light sleeper) dictates whether you sleep. ;)
Insofar as location; you're a 10' walk to the Acropolis Museum and many of the sights to see in Athens. Excellent spot!
Thank you again for the great spot; it really is a gem in a great and safe neighbourhood.