Best view of the Acropolis in Athens (and I mean it), rooftop is even bigger than what it looks like in the pictures! District is really great, many bars, restaurants, coffeeshops, and close to everything. Contrarily to what I could read in some comments, there are people living in the building and the entrance isn't that scary (just a big garage door to be opened with a remote control).
Only negative points : the umbrella on the rooftop was broken (but was probably replaced after our departure) and air conditioning is only in the bedroom.
In the overall we loved to stay in this amazing rooftop and Konstantinos was really reactive in the communication :)