There sa reason why Verona is packed by sccoters and bikes...
You avoid the trafic, spare A LOT of time when crossing the town, park nearly everyway (and there are a lot of dedicated parkplaces) and, most of all, enter the historical city center. NO LIMIT for bikes, no matter if big or small, so you can park just a few meter from Piazza Erbe or Piazza Bra.
An excellent way to go around.
In the picture, a long row of scooters along Corso Porta Nuova... There is mine, too!
P.S. The only scooter rental I found online (no direct knowledge) in town is this one
the city is crowded by cars and especially motorcicles. I think so is whole Italy. Just read an article about rome: something about 200 000 motorcicles every day in rome downtown. Incredible!
If you can decide, better go by bus, train or plane to italian cities, it´s less stressful.