Daniel Pipes (who can hardly be considered a Muslim apologist) visited some Parisian "NoGo zones" in 2013:-
I had an opportunity today to travel at length to several banlieues (suburbs) around Paris, including Sarcelles, Val d’Oise, and Seine Saint Denis. This comes on the heels of having visited over the years the predominantly immigrant (and Muslim) areas of Brussels, Copenhagen, Malmö, Berlin, and Athens.A couple of observations:
For a visiting American, these areas are very mild, even dull. We who know the Bronx and Detroit expect urban hell in Europe too, but there things look fine. The immigrant areas are hardly beautiful, but buildings are intact, greenery abounds, and order prevails.
These are not full-fledged no-go zones but, as the French nomenclature accurately indicates, “sensitive urban zones.” In normal times, they are unthreatening, routine places. But they do unpredictably erupt, with car burnings, attacks on representatives of the state (including police), and riots.
Having this first-hand experience, I regret having called these areas no-go zones.
https://www.snopes.com/fact-check/sharia-law-muslim-no-go-zones/
It's just right wing histrionics. I was amused to find my birth place of Birmingham described as a no go zone on Fox, by some American 'security expert', especially when the Balti triangle is my favorite place there to grab good, cheap grub. Similarly, Brick Lane in London is described that way- utter nonsense. I go there for a balti and a pint whenever I'm in London.
Muzzies notwithstanding, European cities are still far safer than many American ghetto areas. Oh, and the largest muzzie area in America, Dearborn, is also one of the safer areas in metro Detroit.