This is by far the best experience I have had with airbnb platform.
The building is old but well maintained. All the difference is when you step into the apartment.
The interior disigner has worked miracles and the hosts are doing more than they should to make you feel comfortable like at home.
The location of the apartment it's good as well, with two metro stops near by and everything you need quite close. The central landmarks are walking distance.
I highly reccomend it and is definetely the place I will be returning when I'll be visiting Athens.