Italy’s currency is the euro. The seven euro notes come in denominations of €500, €200, €100, €50, €20, €10 and €5. The eight euro coins are in denominations of €2 and €1, and 50, 20, 10, five, two and one cents.
Tipping is customary in restaurants, but optional elsewhere.
Taxis Optional, but most people round up to the nearest euro.
Hotels Tip porters about €4 at high-end hotels.
Restaurants Service (servizio) is generally included in restaurants – if it's not, a euro or two is fine in pizzerias, 10% in restaurants.
Bars Optional, though many Italians leave small change on the bar when ordering coffee. If drinks are brought to your table, a small tip is generally appreciated.