you and
@Bill Walker .
As you alluded to Bill, this is a list of MY favourite cities and not the 'best in the world' as the thread title asks.
I've been to a lot of the so called best cities and found a lot of them to be souless, miserable places with nice things to look at. I like life and people, backstreets, hidden places where you can get a feel for the soul of a place.
Venice, which seems to be popular on the thread is my idea of hell. I've got a perfectly good canal on my doorstep and it's not full of god-bothering, camera waving tourists who can't see past the end of their selfie sticks.