Is the Alfredo di Roma restaurant still in existence and if so where is it located?
If you are referring to the restaurant where Fetticini Alfredo was created, then yes, the restaurant is still up and running. We stayed in that area last may and it is near or on Via Scorfa not far from Navonna.
I just had dinner there last month, it was pretty good! They made a steak in balsamic vinegar that was excellent. I actually thought the Fettuccine Alfredo was a bit overcooked and mushy but everything else was great.
Wear something nice, it is a nicer restaurant for Rome. would not bring children (although I made the mistake of doing so:)