Metro by YDraigGoch
When in Rome, if you can get about using the Metro then do so. Its easy to understand, its quick and very cheap. The trains also seem to arrive on time and there are lots of them. Obviously they are busy in the rush hour, but that's to be expected. 4 or 5 Euros will get you to most places. Pick up a map at the station or ask your travel agent to get you one. Directions are good and easy to follow inside the stations.