Actually I would say old tenement houses areas tends to be often inhabited by some shady fellows than commieblocks, because most of city owned social flats are in old tenement houses. Anyway I'm not familiar with Lubuska area (other than passing by it sometimes...) but maybe this will help you. It is a map of price per a metre of a flat in Wroclaw. It is not entirely reliable, because it is made by some realtor, anyway shows more or less acurate how people votes with their money (red expensive, white cheap, grey no data):