Between spells of rain, we walked aimlessly through the streets of the Eminönü and Fatih districts of Istanbul. Only Rome may come close in the juxtaposition of many different styles of architecture spanning a couple of millennia. Only Kolkata comes close in terms of the astoundingly capable sweet shops at every corner. Nothing matches Istanbul in how laid back businesses are. During a brief rainstorm, when a large number of people rushed into cafes, the service shut down until people left. In other cities cafes might make a windfall (really!) profit serving coffee to cold and damp people.
There are parts of Istanbul where people on the streets are so relaxed and friendly that you are reminded of Porto. Other parts are lined with carpet shops where you might not want to stop to chat with every friendly shopkeeper (although we enjoyed the chat every time we stopped). I have a very small bucket list of places which I want to go back to, and Istanbul is on it.