The airbnb is GREAT! Having AC in each room makes the whole place not hot, and the location is a 2 minute walk from the train station that goes straight to the middle of Rome.
BUT: when I got to the place to check in, the owner tried to give my friend and I only one bedroom with 2 small beds and 1 bathroom. instead of the 2 bedrooms and 2 bathrooms that I paid for. Then he acted like he did me a good service when I asked for another bedroom to be opened. Make sure you specify to the owner what you need!