For all the bad press New York City landlords sometimes unfairly get, there are far more diligent and responsible landlords who make timely repairs to make sure their tenants live in a safe environment.
Subletting someone's apartment is a relatively common practice in New York City. Maybe you need a place to stay for the summer before you start classes at NYU and you find a friend of a friend who's off shooting a movie in Europe for the summer. It's a win-win, right? You get an apartment close to your job and he gets reimbursed for his rent while he's away. Some tenants also sublet their New York apartments even though they're currently living upstate because they don't want to lose them.
Many homeowners have no problem affording their monthly mortgage repayments until they experience an unexpected event that disrupts their finances. This can set off a domino effect that can lead them into debt and can spark wide-ranging cash flow problems.