If you are in trouble, your country's embassy may be able to help you. Here are contact details for some of the English-speaking embassies:
United Kingdom
Via XX Settembre 80
00187 Roma
tel. 06 4220 0001
website
United States of America
Via Vittorio Veneto 121
00187 Roma
tel. 06 46741
website
Canada
Via Zara 30
00198 Roma
tel. 06 445981
website
Australia
Via Antonio Bosio 5
00161 Roma
tel. 06 852721
website
New Zealand
Via Zara 28
00198 Roma
tel. 06 4417171
website