The place was nice, clean and calm. I met Nikos, who was very welcoming. One thing only is that the area in itself is not the most beautiful area of the city. Around the Airbnb it's ok (and in a short walk you're at Omonia Square, and from there you can walk to the centre or a direct metro to the acropolis), but if you go deeper into Exarcheia, the area starts to feel a bit less pleasant (especially at night). That being said, the area does have some amazing restaurants as well.