Question

how nicola and jacopo useful to the narrator

Answer 1

Nicola and Jacopo were useful to the narrator because Nicola and Jacopo ran all kinds of errands for the narrator such as getting him a pack of American cigarettes, buying tickets for the opera, help him with the name of a good restaurant where the narrator and his companion could eat and also, take them sightseeing around the town of Verona plus shining his shoes and selling him a basketful of strawberries.