Also, you've added more fuel to my must-visit-Turkey fire! ;-) Thanks.
It is really worth a visit. Of course if you like archaeology it seems Capadoccia is better (I would say, although have never been there), but if you like culture, imperial history and anthropology, Istanbul is the place to go.
I will always tell people to visit more than the standard districts, specially if they have no important monument. I only could visit one and it was worthy!!!
A pleasure I therefore claim to show, not how men think in myths, but how myths operate in men's minds without their being aware of the fact. Levi-Strauss, Claude