A few years ago, Liz and I took a long weekend to Venice in November. We lucked out massively with the weather: there'd been flooding the week before and the biggest flood in decades the day after we left, but for the 4 days we were there we had beautiful, crisp autumn sunshine.
We're increasingly finding November is a great time for city breaks to touristy cities. Yes, the weather will be chillier and—as in Venice—some places might be closed, but as long as the weather isn't atrocious you get to see a beautiful city without the summer crowds.
Venice was a trip where we definitely avoided the crowds and it was glorious.
This shot shows the Vivaldi Church, taken from a water taxi.