Great list! The best advice is to wander, and to check out the local weekly markets. We've just moved to fishing village Samatya, aka Kocamustafapasa on the Banliyo train line that runs along the Sea of Marmara. 15 minutes from Sirkeci Station (and using the same easy transport card), but a world away from Sultanahmet. Wide parks along the water, hidden ancient churches and forgotten gardens, a vibrant street life, a huge market on Saturdays. Istanbul is full of neighborhoods like this, making what could be an overwhelming mega city a very enjoyable local experience.