Near Vatican city there is a very cool neighborhood with trendy restaurants and bars. I’m talking about the quartiere Prati. This district is full of law offices. In the evening, young lowyers, when end up working, meet each other nearby to drink or dine.
I usually go to La Zanzara bistrot. But even the restaurants that are in via Properzio are at the same level: Calabascio, Il Sorpasso, Sogno autarchico. They serve the typical dishes of italian cuisine revisited in contemporary style. A little further forward there is Porto, specializing in fish dishes. I also recommend taking a look at Borgo Pio, a very characteristic street of Rome, also full of bistrots and restaurants. I know this place very well because my University was right there. But if you want to see the neighborhood from above, go on the terrace of the Hotel Atlante Star at the aperitif time (7PM). The view over roman roofs is imperdibile, unmistakable!
Are you greedy? At Piazza Risorgimento I recommend two places. The first is Old Bridge ice cream parlor. You recognize it because there is always a long waiting line! Another place is Pompi, where someone says they make the better Tiramisu in the city. Try and let me know what you think about!