Rome Guide
Rome
Getting around
Like most Italian cities, even the larger ones, the best way to get around Rome is to walk. Rome wasn't built for motor traffic, and it shows in the congestion. Despite that, its ATAC-run bus service is on the whole pretty good – cheap, reliable and as quick as the clogged streets allow. There are also four tram lines, and Rome's metro operates from 5.30am to 11.30pm, although its two lines only have a handful of stops in the city centre. When the buses and the metro stop – at around midnight – a network of nightbuses comes into service, accessing most parts of the city and operating until about 5am.
Flat-fare tickets on all forms of transport currently cost €1 each and are good for any number of bus rides and one metro ride within 75 minutes of validating them – bus tickets should be stamped in machines on board the bus. You can buy tickets from tabacchi, newsstands and ticket machines located in all metro stations and at major bus stops, as well as from machines on the buses themselves. If you're using transport extensively it's worth getting a day pass (BIG) for €4, a three-day pass (BTI) for €11, or a seven-day pass (CIS) for €16. 
www.atac.roma.it has more information, some in English.
The easiest way to get a taxi is to find the nearest taxi stand (fermata dei taxi) – central ones include Termini, Piazza Venezia, Largo Argentina, Piazza San Silvestro, Piazza di Spagna, Piazza del Popolo and Piazza Barberini. Alternatively, you can simply call a taxi ( 
06.3570, 06.4157, 06.6645, 06.8822 or 06.5551), but bear in mind that these usually cost more, as the meter starts ticking the moment the taxi is dispatched to collect you. Most cabs are white, and a journey from one side of the city centre to the other should cost no more than €10, or around €15 on Sunday or at night. Note that all taxis carry a rate card in English giving the current tariff.