Hi there, both locations are accessible (and cost effective) via the Italian train system, for Rome there is a frequent service to/from Civitavecchia plus a short walk at either end. Florence (Firenze) is a little less easy as you may have to change in Pisa, and the train station in Livorno where the ship will dock is a good couple of miles away - there is a regular bus service to the shuttle pickup/dropoff point.
An alternative is to get a group of you in a taxi, but make sure you negotiate the price before setting off.
Last: Cruise Maritime Magellan Nov 2016
Next: P&O Oceana December 2016
Then: NCL Jade August 2017
Then: P&O Ventura December 2017
Golden, Grand(2), Caribbean, Royal, Sea(4+1 aborted)
Adonia(4+2), Arcadia, Artemis(2), Aurora(5), Azura(2), Britannia, Oceana(3), Oriana(12), Ventura(2), Victoria(5)
QM2(2), QE2(9), QV(7), QE, Caronia(2),
Oceania Nautica, Minerva, Minerva II, Fred.Olsen(8), NCL Jade, =X= Eclipse, HAL Ryndam, Aza.Journey, CMV Magellan