The apartment is clean and has all the comforts you’d want. The WiFi is good, decent shower, washing machine etc.
Location wise you can walk to the acropolis in 10 mins, Plaka and the parliament area are a 15 minute walk.
Loads of great cafes, bars and restaurants. I’d recommend coffee joint for breakfast and burrilos for drinks.
The area is very safe, we never had any security concerns while in Athens.
Transport wise I’d recommend getting a cab rather than the metro, which I found complicated and a bit to busy