The metro in Rome include 3 lines.
The Network of the metro in Rome
The first Line of the metro in Rome is the Line “A”. It is useful to connect you to Termini Station, Spain Step, Vaticano, San Giovanni and other locations in Rome. The second Line of metro in Rome is the Line “B”. It could connect you from Termini Station to Colosseum, Circo Massimo, Piramide, EUR Lake, and other location. The last Line of metro in Rome is the Line “C”, it is still on work. It will connect directly from the home to the Line “A” (will be in May 2017). In the future it will connect from home direct to the Colosseum.
The next future faster connection
In the 2008 began to build the Line “C” (the jellow one). It’s really hard to build a metro line in Rome because Rome is full ruins and in the ground. However its announched the next release of the last stop to connect the Metro C line with the Metro A Line in San Giovanni Stop. It will be a great feature for you, because you can connect to San Giovanni in 2 Stops from Pigneto and 3 stop from San Giovanni to Termini.
You can check on the map all the stop that will be very important such as Termini, Spagna Step, Ottaviano/Vatican City, Colosseum, Circo Massimo, Piramide, ecc…
Considerations and suggestions while moving in Rome
As Roman people as first and as traveller, when you’re coming in Rome for Vacation, I can suggest you to live the city. Living the city means to walk, to enjoy every street, everything is around you. When you walk you can notice every beautiful things Rome can reserve for you. When you move in metro it is faster, but you can’t see the city. If you want to go faster you can use the bus and it is better than the metro to live the city.