Konstantinos' place was excellent for a place near Athens city centre but without the cost of a pricey hotel. The immediate neighbourhood was very residential, but just a block away were several restaurants and a decent sized supermarket. Konstantinos was an excellent host who gave detailed instructions to get to his place and responded to messages almost immediately, and the place was very clean and nice. It is a 15-20min walk to the Acropolis through the beautiful Pnyx, 20-25mins if you go around the hill (which is advisable at night since the path through the Pnyx isn't entirely lit). I felt safe making that walk on my own after midnight after seeing a show at the Odeon of Herodes Atticus. If a quiet morning with a view is something you're interested in, I woke up early one morning to go to the top of the hill (Hill of the Muses, about 20mins to walk to the top) to watch the sunrise over the Acropolis, and it was gorgeous!