I am assuming though your friend may be looking for some of the newer bars ... as well as traditional favorites.
Here are a few that are worth visiting:
Paszkowski - Firenze, it is right next to another great cafe called - Gilli, which was established in 1733.
Giacosa - Firenze, a meeting spot for intellectuals for over a century.
Bicerin - Torino, est. 1763, known for it's coffee, chocolate and cordials.
Platti - Torino, where you can spot Emilio Lavazza still coming in for his morning espresso.
Let me know if you or your friend need addresses on any of these.
I think experiencing the history of some of the first cafes in Italy is great for any barista.