Found this restaurant by chance, after being dropped by the door of Alfredo's by a taxi driver.
Alfredo's was closed so took a walk around the corner and voila! Ara Pacis.
Very crowded with a mainly American clientelle. Great atmosphere, with excellent food.
The staff all speak English and two menus are available - the tourist menu(please dont) or the Italian menu(excellent).
Favorite Dish: Lobster thermidore with a pasta and clam starter(spaghetti vongole). The lobster was still swimming around when we entered. You cant get fresher than that!!