Everybody has their favorite place to dine in Rome. For those who have no taste, there is the Borgo Pio. For those with expensive taste, there's the Ristoratne Alfredo at the tomb of Augustus.
This great ristorante is where famous personages used to go in the 1950s and '60s. Today, just old people go there (and me) but it's a great 1940s dining experience and I recommend it to everyone!