It's literally across the street from the Acropolis museum and train station, and <2 min walk to the Acropolis. The street is lively with restaurants and bars and it's pedestrian only. Do not bring a car, you cannot park here. If you do, park it at Nomismotokopio train station (~3-4 euros a day) and train from there to the Airbnb. The place itself is clean, tons of bed space, and definitely worth the price.