We ate here twice during a recent visit to Naples, GranGusto has cafe/bar downstairs and a pizzeria and restaurant upstairs along with a great supermarket selling top quality local products over both floors.
I had one of the best pizza's ever from here; despite not being a traditional pizzeria (vera pizza) there was no shortage of locals who also seemed to be regular customers. We also ate from their more refined main restaurant menu one night and I had a perfectly seared tuna steak which was also one of the best seafood dishes I'd been served in Naples.
The service was very good, one of the English speaking waiters went to great lengths to make us feel welcome. He even went to the effort of giving us tips on a future visit to Capri and making a note of the name of the wine that we took with our dinner. If we return to Naples we will visit here again, especially to buy more cheese and Limoncello!