My husband and I signed a contract to live above my niece''s restaurant, while renovating it. However, it is not safe to live in; how can we void?

Before we signed the contract, we new the apartment was run down. My husband informed my niece that it was unsafe to live in, but she drafted a contract that stated we are to live in the apartment while renovating it. We are to pay her a certain amount of money, while living there, as well. The day we signed the contract, we tried to back out of it, before signing it; she would not listen to what we were concerned about. It almost felt like we were given no choice, and had to sign it, anyway; she dismissed all of our concerns. Also, at the time we signed it, she said the contract was between her and my husband; but she had me sign it, as well. I signed it with my maiden name, because at the time of this transaction, my husband and I were not yet married. We just got married, today. Neither my husband, nor I, feel safe being tenants at that apartment. We have no problem helping my niece renovate the restaurant, we just don''t want to live above it, while we help her fix it up.