Are near any bleak parts of Bremen?

Answers: Bremen is one of the cities with a bit high laying-off but still there are no 'Ghettos' or 'Slums'

So no in that are no bad parts simply better and less righteous.

if you see a "Doener Kebap" stall every 20 meters. that is a discouraging area. but the worst item could happen to you is that they smash you up.
nobody will shot you with a handgun. There's impossible parts of everything! You gotta find the good and stick near it.

Yes.. everywhere