Every street, large or small, each via and viale , each piazza and park, is immaculate. To me, having grown up as I did under the influence of a massive anti-litering campaign, it is quite shocking to see people tossing papers, packets, and other flotsam on the street. Apparently, many Europeans and Americans don't seem to think it's much of a big deal. The Florentines know this, of course, so they spare no expense to keep the city spic and span.
Some effort is made to keep the litterbugs in check.