Colourful, technically impressive and ridiculously cute, Mario Di Costanzo's sweet treats are what Instagram dreams are made of. The young pastry chef uses only natural ingredients (and no margarine) to whip up masterpieces like salted caramel tartelletta (tart) with hazelnut praline and sea salt. Many cakes are available in monoporzione (single serve), and you'll also find standard morning pastries like cornetti.
You're welcome to eat your pastries at a table at the neighbouring bar, though you'll be expected to purchase a coffee or other beverage as a courtesy.