Italy: De'Coltelli's

My last evening in Italy was in Pisa, in a guest house full of large ugly artwork - the owner took one look at me and said

Forget the leaning tower - you need to go to the best ice cream in Italy, here is a map, this is the route ...

I visited De'Coltelli's twice before supper and once after, this is peach sorbet with pink grapefruit granita