Legally speaking, a nuisance is defined as "a course of conduct which has caused substantial harm to other tenants, to the building, to the landlord's employees, or to the landlord," says Himmelstein, and unless the behavior in question is severe, repeated incidents are a key factor. So in this case, the fact that you've flooded your neighbor's place on multiple occasions does not work in your favor.
When I represent a client who is purchasing a co-op or condo apartment, it is important to look into the finances of the Co-operative or Condominium. A co-op or condo owner does not just own their own apartment. The owner owns a part of the cooperative or the condominium. The financial health of the cooperative or condominium has a direct effect on the apartment owner. Whether the building's mortgage is due to be re-financed or a real estate tax abatement is about to expire are factors that would have an effect on the common charges or maintenance the owner is obligated to pay.