There is a Bar called Don Nino, it is just acroos Pantheon in Rome. I had a Cappuccino and a Crossant in this bar which I paid 2.20 euro. Right after me, my friend went there and she had exactly the same but they made her pay 5.50 euro. Not enough, an American couple paid 12 euro for 2 coffee and 2 croissant to take away. When I knew this, I went to the bar asking an explanation but they were very aggressive and rude. Not only they didn't apologize but they also treated us like fools. So, DO NOT GO to this place and warn your friends. This is trap for tourist. When they hear that you are not a Roman but a tourist, they overcharge you whatever they like.