It's not a "check-in at the old city," but a guided tour of the Byzantine Empire's operating system—understand in half a day "why Constantinople survived for 1,100 years
The guide strings together Justinian, the Plague of Justinian, the Nika riots, and the 1453 siege into one narrative.
Small group slow tour, 3-hour in-depth tour, Hagia Sophia exterior explanation of structure/history, Basilica Cistern entry to see the "Underground Church", St. Irene exterior courtyard explanation, city walls exterior explanation