Great apartment, big room, AC works perfectly, Wi-Fi amazing, the rooftop is huge and very nice!
But the location is in the middle of everything in a big main street and there is no double glazing so if you are a light-sleeper it's definitely not recommended.
Also, the cleaning fee are quite high for it to be included in the final price as I have stayed more than a week and never saw the cleaning lady.
For Athens's prices and moreover for a shared flat, it's a bit overrated in my opinion.