I thoroughly enjoyed staying at Marilena's apartment during a few days in Athens. It is centrally located - close to public transit (metro & bus); major attractions are a 10-20 minute walk. The neighborhood has a lot of nice cafes and restaurants, and there are a few grocery stores a 10-15 minute walk away. The street itself is quiet, but you are right next to a major road. I did notice noise from cars/motorcycles, but it didn't bother me that much, especially after I closed the apartment's heavy-duty shutters.
Marilena quickly and helpfully communicated before and during my stay. She provided detailed check-in instructions and local recommendations. I really enjoyed messaging her!
My only quibble would be that the kitchen could be more fully-equipped, if one so desires to cook. There was only one small knife provided, and I could not find a chopping board.