Hey there,
I stayed in Katerina's place for a full month in November '19. The apartment is indeed cute and well equipped and the neighborhood is safe and very well connected with public transportation.
There are a few nice restaurants and bars very close to the apartment, but also going down-town is super easy and fast even if you make up your mind spontaneously.
The most important thing is the flexibility that the host exhibited more than ones. I will definitely check its availablity again when the time of my next stay in Athens comes.
Cheers,
Antonis