i've never been in rome but i visited trieste - a very walkable city - a few weeks ago and i was shocked how cars were clogging up everything there. not necessarily cars driving, but parked cars. maybe trieste is a bit special because big parts of it are on a steep hill so it's not that well suited for cycling but none the less, i was very disappointed. not a pleasure with kids. i asked an italian friend about it and his answer was: "welcome to italy".
so, walkable - yes, maybe. but cities that get rid of cars are still on a completely different level when it comes to quality.