There are plenty of taxis with larger capacity, for up to six people and luggage available at the airport.
There is no need to reserve or pre-pay for a taxi going into Rome.
At the airport, the pick up and drop- off points are outside the arrivals hall at Terminal. .
SIT Airport Bus (5 per person online, 6 at bus station).
Airport shuttle, mercure, leonardo da, vinci, airport, via Portuense, 2470, 00054 Fiumicino, Italy.Other taxis, such as those licensed by the Comune of Fiumicino, can charge by their meter.For a trip to the airport, you ca buy the ticket the day before at one of the sales points mentioned on the schedule.There have been many negative reviews of this service, especially for the return trip to the airport, as it may take gratta e vinci demo some time to get a bus that has available seats.However, for many parts of central Rome, the suburban FL1 train (see above) would be a better choice.Then you have a way to trace them if there are problems.See the schedule at /PDF_Areoporti.TripAdvisor members concerning the above topic.

It is the most popular way to transit to central Rome so can get very busy.
The tickets for the Cotral bus, as well as for the metro or a bus, can be bought at a tobacco shop or newsstand.
You are not obliged to give a tip to your car or taxi driver.The FL1 suburban service has a number of stops: those close to the centre of Rome are at Trastevere, Ostiense, Tuscolana, and Tiburtina stations.For perhaps less money than a taxi, you can have a driver waiting at the exit from Customs at FCO or at your door in Rome.Buses take about 45 minutes to get to Rome Termini station from Fiumicino airport in normal traffic conditions, but can take considerably longer if traffic is heavy.You can use the ticket at any time within the next several months, but the ticket must be validated just before travelling by punching the ticket in one of the little green and white oval machines dotted about the platform area.Get a fare estimate as time of day or heavy usage raises the cost.Between 08:00 and 23:30, this shuttle service operates between FCO (Terminal 3) to Termini Station.There are three services that are highly recommended on the TA Rome forums.This is a considerable distance from Terminals 1 and 2, where all domestic and inter-Schengen flights arrive and depart.The buses are located at Terminal 3, and ticket price.00 per person online or in person. .(5 per person online or on the bus ).From Termini Station (on right side as you are facing the station) they travel between 04:30 and 20:30.Note that the fixed price from the airport to central Rome applies only to taxis licensed by the City of Rome; these taxis have the City Council's crest (with "spqr painted on the doors.