This place is amazing! I've spent a lot of time in Greece and I have to say this has been one of the best places I've stayed in Athens. It is literally steps away from the main shopping street in Athens, big in space and relaxing in decor. I stayed for a few days while I also had to do work and it was quiet, the internet worked great, and I spent a ton of time just sitting on the private terrace (which was my favorite part, second only to the location). Other than the shops, there are restaurants on practically every corner nearby and a supermarket just a few small streets away. Also very close to a few metro stops, and of course right next to Plaka, the beautiful historic district, and the Acropolis (like the other reviewers say -- you have to check out the shared roof garden; the view is stunning!). I intend to stay at Anna and Efi's place every time I need to make a few-days' trip to Athens.
PS -- These ladies are extremely sweet, responsive, and attentive.