What are the general qualifications to rent an apartment?
Technically, you could pay for an apartment with unemployment benefits. However, if you are unemployed, and trying to rent an apartment, it will be very difficult for you to get approved without having a job. The apartment owners want to make sure that you have a steady income to be able to pay your rent, so they may not want to rent an apartment to someone who is unemployed.
Any statistics for that sort of thing, if they exist, would be only for a particular city or county with a rent control ordinance or similar regulations. In general, a rent discount for apartment maintenance would be negotiated on a case-by-case basis, depending on the extent and nature of the maintenance involved.