3 days (and nights) in Istanbul were definitely too short. Istanbul is great and sizzling. But it's tough: you have to get up quite early to see all the sights and stay wake long nights for great food and vibrant bars and music... The german author Kai Strittmatter wrote: the Istanbul people are like small children - they fight back fatigue and want to stay awake all night.
The appartment in Galata was great and Zeynep was the perfect host with hints for restaurants and more.