It's a breakfast drink, the Italian version of cafe au lait.
In Italy, they make it with beautiful swirls. After noon, you drink this in the photo for your needed jolt (but you can get "Cafe Americano" if you ask - all they do is to put a double espresso in a cup, and add water. 2.5 Euros for that, but it's Monopoly money. However, they always serve that Americano with a little thing of hot milk, which is good). Some hotels make ordinary American-style coffee, and it is excellent.