I had a pretty poor experience last month with limoservicerome so I would recommend you avoid them.

Made a reservation for pick-up at FCO to be dropped at the Cavalieri.
Was provided with a drivers' name, Massimo and his cell and he was given mine, flight number etc.
Supposed to be waiting at arrivals with my name on placard.

Arrival on time, but bit slow through Passport control, no driver.
Call Massimo on the cell, excuse given " very bad accident traffic..bad delays" be there in 10 mins.
30 mins later " my driver now pulling into airport" obviously not its not Massimo who is making the pick-up after another 20 mins I decided to take a taxi, fare 55 euro.
Wasted over 1 1/2 hour in a exercise that would have cost 8 euros less, but wait my t-moblie charges came up to almost that anyway.
Moral of the story sometimes its not worth it to save a few bucks.

mike
edited for spelling