This is one of the best places to stay in Athens and Monastiraki. Close to everything, yet not in the middle of the tourist area. iFeel cafe is 30 seconds away. It's quiet (except on the terrace during weekend evenings, where you can hear the music and local night life - this was a plus for me). I loved the aesthetics and craftsmanship of the interior design.
There is also a high attention to detail, and everything is available. The only thing missing was a proper iron for ironing clothes.
The internet worked flawlessly.
Minor negative: the entry hallway in the building was crammed with random stuff. Also, from the pictures one might think that the terrace is on the interior of the building. It is in fact on the side of the building and you could look down to the pedestrian street (Esopou) two floors below. This arrangement is even better IMO, and I've spent a lot of the time planning my vacation on the terrace (the WiFi works very well there, as in the rest of the house).