Considering Lisbon had one of the finest gelatarias in the middle of town that I've ever been to (complete with large servings and unlimited number of flavours even for a small cup), it was surprising I didn't see many in Porto.
I actually had to specifically look online to find one in Porto. Sincelo came up and happened to be very near a food destination I was planning (Solar Moinro de Vento) and so it seemed the perfect dessert follow-up. The gelato is fine without being overly memorable. It's nonetheless something to look forward to.