Istanbul's historic peninsula contains the ruins of ancient Byzantium, the capital of the Eastern Roman Empire, and the political centre of the Ottoman Empire at its height — all on the same physical ground. The monuments are not scattered curiosities but a dense operational landscape: Hagia Sophia (still an active mosque), the Blue Mosque (still calling five times daily), the Grand Bazaar (still trading as it has since 1461), and the Topkapi Palace (now a museum but architecturally intact).
Sultanahmet is the densest monument quarter, but the old city extends well beyond it. Eminönü, at the Galata Bridge, is one of Istanbul's most commercially active waterfront neighbourhoods — the Egyptian Spice Bazaar, the Rüstem Pasha Mosque (with its extraordinary İznik tiles), and the constant ferries between the city's shores all operate within a few hundred metres. Fatih, to the west, is more conservative in character and less tourist-oriented, with excellent local restaurants and mosques that see very few international visitors.
The Küçük Ayasofya Mosque neighbourhood, south of the Blue Mosque on the Marmara slope, is the old city's most charming residential area — quieter than Sultanahmet, authentically residential, and home to some of the finest small boutique hotels in the area. Hotels on the Marmara side capture sea views that the inland Sultanahmet properties cannot.
For food, the old city has improved dramatically. The tourist-trap kebab houses around the main monuments are still there, but a generation of younger Istanbul restaurateurs has opened genuinely excellent meyhane, seafood, and modern Turkish restaurants in the Cankurtaran and Küçük Ayasofya areas — serving food that reflects the neighbourhood's multicultural Ottoman heritage rather than generic tourist expectations.
The Tram T1 is the old city's transport spine — running from Bağcılar in the west to Kabataş on the Bosphorus shore, it connects Sultanahmet to the Grand Bazaar (2 stops), Eminönü (3 stops), and Karaköy waterfront (4 stops). Almost all old city hotels are within a 10-minute walk of a tram stop.