If you have an issue with the way the landlord (you) has handled things your options are therapy or GET DOWN ON YOUR KNEES and pray.Your recitation of events reflect the owner acted in a timely manner and you failed to report the leak.

Edward emailed me and said that he has been trying to get a hold of me by phone. (1) I never asked Edward to call me (2) My email clearly works... why didn't he try that after the call failed? 

Prolonged enthusiasm can be exhausting (failed offers, tours, travel) one way to remain engaged is to stay connected and in constant communication.

No one who successfully runs a business fails to notice that they haven't been paid for a couple of months.

If the landlord fails to inform the tenant and the latter suffers substantial loss or damage to his/her personal property as a result of flooding, the tenant may terminate the lease by giving a 30-day notice to the landlord.

Would be hard for me to believe that a manager can fail to provide leases in a situation where management is being transferred to somebody else.

If tenant fails to pay rent as agreed upon the lease agreement, the landlord has valid grounds to evict a tenant.

It is usually better to have a clause for the destruction or return of information in the NDA so that if negotiations fail, the sensitive information still stays protected.ConclusionThe law covering NDAs is complex, so it is always good to review it with a lawyer before signing.

If they fail, I offer it to the next qualified applicant.3.

Failing that, what can I do to actually ensure tenants are paying their part of the water?