This article is seriously lacking in photo evidence. Aside from the headline image, and one of dumpsters, none of the photos contain any trash or graffiti.
That's because its main point is... more than a bit overdrawn.
Yes, there's an obvious trash problem in certain areas (especially near Central Termini) and in certain parks. Which can be a bit eye-popping if the standard you're comparing to is on the order of, say, Switzerland.
But by and large it's just not that huge of a problem in most areas - and at the end of the day, it's still a fantastically beautiful city. Its main problems are: (1) lack of first-class transportation system (2) tourists (3) of course, Italian politics.