What was it like living in the slums in the early 1900's?

Living in the slums in the early 1900's was horrible. Immigrants had to live in tenements that were breaking down and collapsing. Tenement owners id not clean up the tenements either, so they were filthy. Rats, mice, you name it. These tenements were expensive too. The people blamed the immigrants of being dirty, and that's why the tenements were so filthy, but that all the immigrants could afford and it wasn't their fault.