Teo's apartment is located so close to the Monastiraki Square that it's super easy to get to all the historical attractions everywhere. It's about a 3-4 minute walk from the metro station which was really convenient coming from the airport. Teo also provides detailed instructions on how to get to the apartment from various modes of transportation. I would definitely recommend staying here if you want to be close to Hadrian's Library, the Acropolis, and the Agora. All are a reasonable walk from the apartment.