The apartment is comfortable, at a very good location (Kolonaki) close to cafés, bars, stores etc.
The only issue was that after I checked in, I noticed some long hair on the bathroom floor and on the dining table, as well.
This meant, that the apartment had not been cleaned properly in accordance with the COVID-19 health regulations. Even if the time between check-out and check-in is 3 hours (11:00-15:00).