The apartment was really in the center of old town. It had everything we needed. Great starting point for exploring Edinburgh. We were two people, and it was just right. The communication with David was before the trip and we had all information we needed to find the apartment and to enter it. So we did not spoke with him during our stay. I recommend you take a cab from the airport, since the apartment is on the other side of the castle. Otherwise You have to walk up und down when you come by bus or tram.