“Packed” is the right word. Most of them were workers who earned barely enough to stay alive. That made for very tight living arrangements. [Wiki picture](https://upload.wikimedia.org/wikipedia/commons/thumb/c/c2/Jacob_Riis%2C_Lodgers_in_a_Crowded_Bayard_Street_Tenement.jpg/782px-Jacob_Riis%2C_Lodgers_in_a_Crowded_Bayard_Street_Tenement.jpg) For more pictures, try “lodging house” or “tenement”
The best modern equivalent would probably be the coffin homes in Hong Kong, though at least people there have *some* personal space. In 1900 London “privacy” was an utter luxury.
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