The apartment is very well located, even though arrival could be complex if the shop is closed (at night and on Sunday). Tourigo should proactively inform customers about this if they arrive after 5 pm (this was our case but Tourigo didn't inform us, luckily a neighbor was entering the shop at the same time and opened the gate).
Moreover the door cannot be fully locked (you close the door which only opens with the key but it is lot locked..). You can hear neighbors and elevator during the night or early morning.
Elevator is strange but works well.
Athens is great to visit and Tourigo's apartment is a good compromise, even if it is not perfect. We globally enjoyed our stay in Athens.