Rested in the apartment for a few days five of us. The apartment is absolutely normal — clean and comfortable. Sometimes there is noise from the street, it can interfere with someone. In general, the audibility in the apartment is quite good (you can hear what's going on in other rooms). This is a minus. Another disadvantage is that there is only one pair of keys. For us, since there were five of us, this was a small problem. But not critical.
The apartment is nice, there is, in principle, everything you need and even a little more! :-)
The location is excellent! Perfect for a few days in Athens.