We weren't able to meet Dimitris as he was not in Athens at the time. However, we were welcomed by his friend who showed us around the apartment. He was also waiting for us by the entrance so we didn't have any troubles looking for the place.
The apartment is in a very good location! We loved our walks to the Acropolis and the surrounding area. The restuarants recommended were also fantastic. I would highly recommend this spacious and modern apartment!