Why were tenements a difficult place to live for the urban working class?
Because of the living conditions.
Tenements were grossly overcrowded. Families had to share basic facilities such as outside toilets and limited washing and laundry facilities. There would have been no hot water or indeed running water, and within each family living space there was also severe overcrowding. There was widespread poverty, disease and infant mortality. Unscrupulous landlords charges high rents for appalling conditions.