ATMs at every airport, most train stations and widely available in towns and cities. Credit cards accepted in most hotels and restaurants.
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.