Thought the typical Roman business day gives the impression of having little business in it, it actually begins early and ends late. Romans start their day at the nearest bar. If you are having coffee at the counter first pay the cashier, then take your receipt to the bar and give your order. Or try to world known cappuccino, half espresso and half milk. Rome's bus service is an efficient one.
Tickets are also inexpensive and sold at tobacconists or newspapers stands.
A complete list of the bus routes can be found in the yellow pages of the telephone book. Romans board the bus from the rear, insert tickets in a validating machine, then proceed toward the front. Keep your ticket, as controllers often come aboard for spot checks. Claustrophobic be warned - Roman buses can get extremely crowded. Avoid the latter unless absolutely desperate, then negotiate a firm price before setting out.