When I stepped off the plane in Florence last month, it dawned on me that it had almost been 20 years to the day since I was last in this city. Why I left it so long, I have no idea. But 20 years later I was back – older, a bit wealthier, better dressed but in no way wiser. I had originally planned to visit Rome. But then saw that thanks to Qatar Airways joining One World, I could now book a flight straight through to Florence with a short stop in Rome. I’m relieved to say the city hasn’t changed. It just has more Chinese tourists. I have…