We had an amazing 30 days vacation at Miltos' house. The apartment is safe, confortable, and has all you need. In addition, it's nicely decorated; and Miltos is friendly very very helpfull.
The location is also good. Five minutes of Plaka and Acropolis. Two minutes from the metro station. You can find good restaurants, shops, bars, etc.
The Internet speed is low, but it works. Despite that, we strongly recommend that place.