I had a short stay at Iwanna and Zois' place before the nationwide lockdown in Greece. We arrived on a sunny day at a perfect time to enjoy the rooftop!
It's on the 3rd floor (counting as a French person) of the building but the part the additional key opens is private. The view is amazing and the Acropolis is actually much closer than what it looks on the pictures.
After spending a week in Athens beforehand I started having promenade patterns and the place happened to be in one of my favorite areas. It's on the quiet side of the Acropolis, on the hill where also sits the Athens Observatory.
The apartment has a bedroom separate from the living room which is pretty well organized. It's not exactly huge but we didn't feel squeezed as two persons. The bathroom is pretty convenient and we didn't have troubles with spilling water and evacuating the steam thanks to the window.
Zois welcomed us in person and was always quick to answer any of my questions.