Our all time favorite trattoria in Rome, Orso 80 (80 Bears), on Via del Orso.
You can dine indoors or outside, as you prefer, weather permitting of course !
I've been eating at Orso since the mid-70's !
If you order the antipasto for everyone at your table (even if just you and your sweetie),
the waiter just keeps bringing more and more dishes to your table.
Highly recommended!