If you think you might be doing more international traveling, you might want to buy a cheap unlocked GSM Android phone. You can find these new in the $100 range on Amazon or EBay. It won't have all the bells and whistles, and it may have a slightly older version of Android, but it will work with all the things you want to do. Then you can buy the TIM SIM card when you get to Italy. You could activate the AT&T international calling plan for your Galaxy, in case someone at home needs to get in touch with you, but, as MrZukini says, keep the data services turned off!
I use an even cheaper data plan for my Android phone; the TIM x Smartphone plan costs only 3 euros a week, and gives you 250 mb of data. It's always been sufficient for me, for checking email, mapping, and light-to-medium internet browsing. It probably wouldn't be enough for lots of videos or uploading lots of large photos.
I suggest you ask for the TIM International option when you get the SIM card. It's free to activate, and would allow you to call the US at reasonable rates (20 cents a minute plus a 16-cent connection charge) if you should need to call somebody back in an emergency.
If your stopover in Paris is after you leave Italy, you should activate another option, TIM in Viaggio Full, when you get the SIM card. This would allow you to make calls to the US or elsewhere in Europe for 16 cents a minute (plus a 16-cent connection charge) and if you use data services, it will charge you 3 euros for 25 mb per day. It charges you only on the days you actually use data services, so if you find a wifi connection at the airport, you won't pay the 3 euros. This option also is free to activate.
If your stopover is on the way to Italy, I would just try to find a wifi connection. If you want to make calls, use Skype on your phone. (Do get Skype and try it out before you leave home.)