For two summers, we stayed in Padua for a month at the Hotel Casa del Pellegrino, across from the Basilica of St. Anthony of Padua. Friso was our local gelateria, just a few steps from the hotel. It is one of the best in Padua (and maybe in Italy or at least in the Veneto).
Most gelaterias in Italy have pretty good stuff, especially those that are "artiginale." But Friso is special. They make all their stuff on the premises and have video to show you how their gelato is made. The flavors are great and not only do they have the usual gelato but they also have wonderful granitas. My favorite is to have chocolate granita with panna (heavy cream). It is truly wonderful. If you are in Padua, definitely go to Friso. You won't be sorry.