so basically u guys are saying they need to get to the airport at 5:30, which is 20 minutes before the train starts running.
turning it looks like then need a faster than light train (in which case catch that instead of a slow plane)
or u may need to get to the airport another way, say taxi, or book into a a hotel near the airpot the night before.
I suggest u talk to the airline and ask them how early you need to be at the airport. Also see if you can get a map of the airport before hand. All i found was
(im afraid its not very good)
or you could try http://www.adr.it
its the rome airport website, you may want to run it through babel if your italian is a bit poor.