Balat and Fener are the old Greek and Jewish quarters along the Golden Horn — now the most Instagrammed, most painted, most written-about neighbourhoods in Istanbul. There's a reason. There's also a way to see them that isn't just the stairs.
Arrive by ferry. It's an honest landing — a small pier on the shore, a ten-minute walk up into streets that still feel residential, cats asleep on every stoop. Start with the Patriarchate: it's spiritual, it's beautiful, and almost no one visits. From there climb up to the red Greek High School, cut over to the stairs (they're worth it, they're just not the whole point), and then wander down through Vodina Caddesi.
Sundays are best. The antique market sprawls across Ferruh Kahya, the cafés open, and the whole neighbourhood feels like a village within the city. Walk back down to the water and catch the ferry east. Forty-five minutes on the Golden Horn, the domes and minarets in sequence on one side. Dinner in Eminönü if you're lucky.