I was at the center of Fiorence.
Used to be called Rep. Com. RMTE (la Simoni)
Nice.
Now I like to stay on the Pitti Palace side near the Gardens, but when I was a student and even traveling with my husband in our back-packing days, we always stayed in a pensione built out of an old monastery facing the Ospedale degli Innocenti. It was blessedly quiet there tucked away behind the Duomo, no cars allowed in the square, and we had a little terrace for morning coffee while looking at the Della Robbia plaques. In those days it was still an actual Italian neighborhood too, with little artisan shops and kids riding their bikes and playing futball in the square. No more.
I'm off even the centro in the last years, even if I go in winter. Apple stores and Victoria's Secrets and an Eatitaly for goodness' sake. Even off season you're tripping over university students with New York accents.
The article is right. If you've seen all the sites and museums, better to go someplace like Vinci, or over into Umbria. It's not quite as over-run.
Todi is a lovely town and it's beautiful countrside. It holds a warm place in my heart because we went to see it the first time we rented a car in Italy. My husband put diesel fuel in the car! Don't ask. A garage owner in to do paperwork on a Sunday took pity on us and drained it out of the car. I had two babies. He even had us follow his car to get on the right road. My husband has never forgotten that he put on a beautiful, pressed, snow white coat to work on the car...he looked like a surgeon.

Bless him. It's funny now, but it wasn't then.
Spello is gorgeous too, and Spoleto. Parts of Spello are so beautiful you can't believe it's real.
Gubbio looks like something that should be in Game of Thrones and the food is spectacular: lots of meats, pasta with truffles and on and on.
Concert in Cortona: is there anywhere else in the world where so many average people would be able to sing opera?

I don't think Rieu was any too pleased, but you're not going to stop an Italian crowd from singing along.