You lucky SOB. That's awesome, man I wish that I could go back sometime soon. Giovanni is great, I bought quite a few pipes from him when I visited Florence. I've been three times and picked up a Rinaldo, an Il Ceppo and really nice Ser Jacopo. I also loaded up with toscano cigars. He's got a great selection of pipes and tobaccos.
I was amazed when I stumbled upon Castellano's in back of the Duomo on my first visit to Florence in the early 90's. It looks like such a small place but it is loaded. The stores here in the US that I've been to are all much bigger but have a far smaller selection. His pipes per square foot density must be through the roof.
Peace Out,
AnchovyD