After spending an entire week at Anna and Efi's place, I am happy to recommend it with much enthusiasm. The location is nothing short of perfect. Central and within walking distance to all of the sites that most tourists would want to explore in a first or second visit to Athens. In close proximity to the apartment are several super-markets, tons of restaurants, cafes, and shopping opportunities. If you're into fitness, there's a Holmes Place just five minutes from the apartment.
The apartment is exactly as shown on the web-site. Better still, it is so quiet, I slept like a baby. Even light sleepers will find the bedroom extremely quiet with no outside noise whatsoever. This was a major plus for me.
Without hesitation, I'd book this place again next time I'm in Athens.