This has been said before, but IME you have "waves" of settlement in poor areas. First of all you get the "alternative" folk, the squatters etc, who're (generally) good people who bring buildings back into use, whic often gives that area a "boost" in terms of making it visible to the next wave; the "arty types" who move in because of cheap housing/rents. This is often followed, once a "scene" develops, with the bohos moving in, and on their coat-tails come the "edgy vibrant" crew, hoping some of the edgy vibrancy rubs off on them, colouring their humdrum 9-5 lives by association (sweeping generalisation to annoy Crispy

).
Of course, the result is that the
latter parts of this "colonisation" don't generally have the redeeming features of the former parts, as they tend to not contribute to the
locale in the same way.
That's my (admittedly class-prejudiced) opinion, anyway.