If you feel the service warrants a gratuity, tips should be between 5 and 10 per cent (some foreigners tip 15 per cent), but if you get poor service, you can forget the tip. It is always at your discretion. In some restaurants, service is already included in the price; it will be stated on the bill or the menu. For a waiter or a taxi driver, 10 per cent is appreciated. For a hotel porter, 1 EUR is sufficient.