I have stayed in both I prefer the Sheraton than the 4 pts. The 4 pts is ok though, and I suspect there may be more to walk to in terms of restraunts at the 4pts. HOWEVER, if you are fortunate enough to be in Rome, spend friggin 10 bucks cab it to central rome for dinner. See dinning section of FT for recommends. The Sheraton is much closer to downtown than the 4pts. I was given as Plat large exec room w/ lounge priveleges at Sheraton and Jr suite at 4pts.
Good Luck.