Many years ago I was in Rome and ate at the restaurant, Alfredo's, that claims they invented the famous Fettuccine Alfredo -- that fettucine with the "tripple butter" sauce that some people have described as a "heart attack on a plate" (but, it's SO good!).
I don't know if Alfredo's is still in business, or whether it is still worth it, but I enjoyed it at the time, and as a recall, it wasn't terribly expensive. But, that was 1970 or so...
It is undoubtedly "tourist," with photos of famous movie stars on the walls who supposedly have eaten there. But, I liked the food, and the local white wine they served was great.
Probably best to leave this just as a nostalgic memory -- it might be a tourist ripoff today. But, check it out.