Giving tips to guides & drivers in Italy
First thing's first, you need to know that tipping is not obligatory in Italy and is totally up to you. If you're satisfied with the service you may leave a small tip of several Euros or 5-10%, say, to your driver, waiter or guide. The common norm is simply to round up your bill to the next Euro.
What is more, when you're having a meal in the cafe or restaurant make sure to take a look in the menu as the tip might actually already be included to your bill. Such a service charge is called "servizio" in Italian.