Recommended transportation from the airport to the city
In Rome, the train from the airport is a "recommended" way to get downtown, however, you may find that for two persons, a taxi is a preferrable way to go. When you consider the train fares, schedule, taxi fare from Termini station, and the train hassles, you may want to consider hailing a cab. Cabs are less stressful after a long transoceanic flight; they are reasonable and comfortable.
Tickets on the Leonardo Express train are about 14 Euro per person, less on the Metropolitan FR1 service - although with that you'll have to change to reach Termini.
What about taking a taxi?
http://www.comune.roma.it/PCR/resourc...
For the Comune of Rome's explanation of the fares:
http://www.comune.roma.it/wps/portal/...(Some changes - including an increase of 5 Euro to both airport rates - were set to take effect, apparently, on 1st January 2011 but as of yet nothing has changed)
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Once you arrive in town, you can decide how to get to the attractions. You should find Rome easy to walk EVERYWHERE. You get to see more, meander in and out of shops, and it is no more than 45-50 minutes to any attraction you will want to see in major downtown areas. You do need good shoes as the brick or cobblestone streets are tough on your feet and legs.
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Should you feel you've been cheated by one of the licenced taxis, the link for the English version of the Rome Comune's official complaint form is...http://www.comune.roma.it/PCR/resourc...
There are some explanatory notes on the Italian version, intended to assist in the identification of the offending vehicle and its driver - roughly, they translate as.....
1 TAXI licence number
Shown on the vehicle's front doors (near the symbol of the Comune of Rome) and also on notices beside the numberplate on the rear of the vehicle and affixed to the inside of the left rear passenger's door.
2 Name of the driver
Shown, together with the TAXI licence number, on the notice affixed to the inside of the left passenger door (in some cases, instead of a person's name, that of the relevant taxi cooperative is shown)
3 Radio Taxi company
The Radio Taxi firms operating in Rome are as follows: 3570 Radiotaxi - 6645 Prontotaxi - 4994 La Capitale - 4157 Tevere - 8822 Eurocosmo - 5551 Samarcanda - 5601646 Ostia Lido
4 Radio Taxi abbreviation
Varies depending by Radio Taxi company, but a name (an Italian or foregin city, country, river, star or gemstone) followed by a number