Strolling in Rome

Follow the RS Heart of Rome or Dolce Vita walks- those are mostly in pedestrianized areas

There's a couple ideas I would suggest. (I have visited Rome two times.)

• Piazza Navona. It features the Fountain of the Four Rivers, grand statues representing four major world rivers (Nile, Danube, Ganges, and Rio de la Plata) topped by an Egyptian obelisk. The piazza has historic origins, as it was built on the 1st-century site of the ancient Stadium of Domitian, retaining its elongated oval shape. And the piazza has a vibrant atmosphere, ringed by great eateries.
• Piazzo de Popolo. It features the Flaminio Obelisk, an ancient Egyptian obelisk dedicated to Pharaoh Ramses II that stands in the center of the piazza. The piazza has the Twin Churches, the Baroque churches of Santa Maria in Montesanto and Santa Maria dei Miracoli sit at the southern end, looking identical at first glance. It also has the Santa Maria del Popolo, a historic church by the northern gate housing famous art masterpieces by Caravaggio and Raphael. And it has the Trident; three major streets—Via del Corso, Via del Babuino, and Via di Ripetta—branch out from the square into the historic heart of Rome.
• Appian Way: The Appian Way is truly worth visiting, but it takes some doing to get there from the city center. (If you're feeling adventurous, there's a bus that takes you from the city center to the Appian Way; I took the bus.) The Appian Way is a 330-mile-long, ancient Roman road that stretches south of the city to its Mediterranean port in Bari. You would be walking on 2,000-year-old paving stones. And you would walk past a parage of fascinating ancient sites. A good terminus is Aqueduct Park (https://www.turismoroma.it/en/places/park-aqueducts). From the start of the Appian Way to Aqueduct Park is about 3.5 miles.

Go to the Trastevere area. We stayed there for a week and it is a lot quieter for strolling aroubd and visiting gardens and shops. They have some busy areas but not as many cars and scooters as say near the Pantheon, Coliseum, etc.

The best 'strolling' I've ever done was in Rome. I simply turned left (one day and right the next) off of any busy street. I found little shops with fun things to look at (and buy sometimes). I also had some great lunches and aperitivi. Some of the buildings and small piazzi I came across provided great opportunities to stop and look and enjoy. Sometimes you're only a block or two from one of the main sites - an easy walk to see it and an easy walk back to get away from the crowds. I think just about any area would give you a chance for some great strolling.

I guess I’ll be one of those whose reply doesn’t really address the poster’s question. Ha.
I am far from a Rome expert, having been once about 3 years ago. My wife and I (mid 60’s at the time) spent 3 nights and walked everywhere. I don’t recall ever being bothered by traffic while walking. Everything flows and we could find our own pace. I don’t remember feeling too crowded or pushed along. Only being there for 3 nights didn’t allow us time to get to quieter sections. We spent one late afternoon through evening walking through Trastevere. Certainly less traffic, although not quiet, good restaurants and Church of Cecelia.
We also walked from the Spanish Steps to the Borghese Gardens which is a nice walk and finished by visiting the Borghese Gallery which was very nice.

Trastevere (area between P.za Maria in Trastevere and up to Piazza Trilussa)
Centro Storico anywhere (basically the area encompassing Campo dei Fiori, Piazza Navona, Pantheon, Trevi fountain, Piazza di Spagna)

Most streets are totally pedestrianized therefore no need to worry about cars or mopeds.

I visited Rome a couple of years ago in April over a holiday time and found most strolling was actually more like a slow slog through crowds...but there was one experience that stood out for me, and that was visiting the Borghese Gallery on a Sunday, and afterwards I had lunch there and spent the next several hours exploring the lovely, peaceful park, map in hand, with the plan to exit and come down into the city proper again via the Spanish Steps. It was exactly the respite I needed. A late afternoon visit to the Forum and Palatine Hill (part of a ticket that included the Colosseum) was also enjoyable, and I felt more able to take it all in without horde of people around me.

Late Saturday afternoons into Saturday evenings the stroll from Piazzo de Popoloand all along Via del Corso is an absolute delight of the masses enjoying the city. Car-free.

I second the Trastevere suggestion. It is a pedestrian enclave of little squares woven into a maze of alleys and side streets with shopping and restaurants. You'll see local Roman families strolling there in the evenings, so it's not ONLY tourists. It's easy to stroll, or just sit and enjoy a gelato while listening to street performers and there is no vehicle traffic to worry about.

Thanks everyone for all these great ideas!!

We walked up Janiculum hill from Trastevere (Giancolo is another name for the area) and it was a gorgeous view of all of Rome from there and also an interesting and nice walk. It has a lot of history with statues and plaques to commemorate different battles and prominent Italians.

You will find traffic is on the main avenues, which for central Rome (the Centro Storico) is relatively few streets. Most of the area is pedestrian, or lightly trafficked/restricted streets. To be honest, I found the bike tours and golf cart tours more annoying than the odd vespa or scooters, because you had to move out of their way, the scooters make their own way around you.

If you get off the main streets, then things are pretty pleasant, and much more interesting. On this site, there are a number of audio tours that are excellent walks (see here: https://www.ricksteves.com/watch-read-listen/audio/audio-tours ) including the Heart of Rome walk, The Jewish Ghetto walk, and the Trastevere walk. The area around Trajan's Forum is great for ruins, for a change, you could get to park at Villa Borghese. Further out would be someplace like Parco degli Acquedotti, or the Park of the Aqueducts, or out along the Appian way.

We like to start in the Testaccio neighborhood, the neighborhood itself is great for exploring. From there we like to stroll along the Tiber Rriver. Along the east bank you can stroll at street level towards the island Isola Tiberina. Along the west bank we like to cross the bridge from Via Marmarata. If you cross on the north side of the bridge you come to a ramp that takes you down to the river’s edge. Then you can either turn around and walk back or climb the steps below the Ponte Sisto bridge and end up in Trastevere. Or cross the Ponte Sisto bridge and walk towards Campo di Fiori.