First time checking out the Aria location.
It's not as fancy as Bellagio's with the chocolate fountain but it is wider with gelato one side, and the pastries & coffee on the other. All of gelato & pastries are great, with favorites being the hazelnut gelato, strawberry sorbet, and the Nutella brioche. Their coffees are good too, and much needed with the Nutella brioche, since it is just a brioche FILLED with Nutella.
Of course, with it being a casino location, it is pricey, but quality-wise, very good. Expect $5 and up for a latte and $4 for a pastry.
It is also close to the Vdara so if the market cafe at Vdara's not looking too good, make the short trek over to Aria for some legit pastries!