Go talk to a landlord of a rent controlled or stabilized apartment in New York City.  

This way I control who does the repairs correctly. 

One or a few of these could help alert you next time this is an issue. https://www.biggerpockets.com/forums/52/topics/412542-water-leak-detection-devices?

Have control over things that are your responsibility.  

I make money when deals close - not on all the BS before there is an offer, so I control my activities that could be a waste of time.

All real estate agents log into a subdomain of MLSListings (pro.mlslistings.com) to enter and access listing information.The Silicon Valley Association of Realtors (SILVAR), Santa Clara County Association of Realtors (SCCAOR), and the San Mateo Association of Realtors (SAMCAR) control who has access to enter listing information into the multiple listing service and by setting standards of conduct, regulate real estate agents.

Stay in control of everything you are responsible for.  

I would steer clear unless you are able to purchase both sides so you have complete control of the property.

You are creating value and since you're the one creating it, you have a lot of control.

Always control what you are responsible for until other people can be trusted.