Finding Leonardo in the Hills above Florence

I thought I knew Florence. Well enough, at least, to know the bus routes. Until in between visits someone changed the stops.
Once upon a time when I stayed a while in Fiesole, I’d catch the bus down to Florence and alight near the Duomo. Now, after dutifully buying my ticket from a Tabacchi I walked around the entire Piazza Duomo — twice — to no avail. The route had changed, and the…