Very nice place and situated in the middle of everything in Athens! They are very nice and answer back very quickly. The only issue we had was that we need a key to open the door from the inside if it is locked on the outside but they only provide one set of keys (even though we booked for 5 people). Some of the people staying with us in the airbnb locked us in by accident (and then left Athens) so we had to call the hosts to unlock it for us. That is dangerous in the case of emergencies like a fire. They answered very quickly and fixed it for us (at 5:30AM) so we are very thankful! I want to make it clear that the problem wasn't their fault, but they can do stuff to prevent it from happening to others (add an extra set of keys in the apartment, communicate how the lock works since it is not common, etc.)
Otherwise it is a very nice location and the appliances are easy to use. We all enjoyed our stay!