Soldato
Usually the way a cities designed and development, in Bristol for example the the east/west side difference in quality could be attributed to the way M32 divides the city in half. In American cities you'll find the post industrial revolution had a lot to do with the rough areas, cities expanded while dity industry reduced making the city centres more financial oriented surrounded by the indistrial areas which in turn are surrounded by suburbs which typically houses the ones that work in the centre. Unfortunetely all cities are gona have good and bad areas, it's just a balance for a working city, the bigger the difference in salary the bigger the difference in "roughness" /obvious