The suburb I live in is called Maisons-Alfort. Though we've got some fair things out here, it is nothing outstanding (yet), honestly. I would only call it decent.
We don't have crime. We're a (gentrifying and somewhat upper) middle class suburb, so most locals are busy at work to feed their kids on the best they can afford.
Some urban lots here and there are still a bit messy and need some treatment. And the architectural options of our Conservative mayor are not always those I would advertise, far from there.
But overall, we're ok, in light blue on that map of the Paris region I just found in the Fr-speaking section of SSC.
https://www.metropolitiques.eu
I'm bringing it on here cause it's likely to be informative to all those who don't actually know the metro area in details.
Purple: senior officials, teachers and students, people working for the media or show business, artists.
Dark and light blues: entrepreneurs, (senior) executives, engineers, lawyers, doctors, better-off retired... Folks like these.
Dark and light greens: farmers, blue-collar workers and some engineers.
Yellow: lower middle class like blue-collar workers, clerks of lower ranks, employees lacking better skills and so on.
Red: rough working class. That's where people really lack education and most crime is.
That's about it. When you spent your entire life here like myself, you may feel home pretty much anywhere in there.
But when you're a tourist, you'd better stick to purple and blue. Some green or even yellow may do, but do not try red.
It'd be risky for a lost tourist.