The ice creams there are Italian, the staff speaks Italian, and the shop is perfectly situated in Aker Brygge, next to Wendy's coffee, towards the end of the dock (towards the Astrup Fearnley museum). I can hear people around me say "let's go for an ice cream". They know this place too.
I didn't dare take pictures inside the shop but here is the ice cream I went for today:
For info, their green apple and lemon flavors are less sweet than generally and a bit more acid. I like it this way (tastes more "authentic") but you may dislike it if you are used to very sweet ice creams.