Nasos place is perfect for a city visit, due to its convenient location 2 min walk to Acropolis & Acropolis Museum.
The apartment is great, sparkling clean and the AC units will cool down the place quickly which is something to consider if you visit Athens during summer months.
Despite being centric it's pretty quiet and has a lovely rear patio where you can enjoy breakfast or dinners.
PS: You can access the rooftop of the building with great views of the acropolis, specially during the night!