Those failures are  more negligent than a PM allowing a guest who paid with expectation to stay at the house to remain there in the middle of winter when they arrived on a Friday evening as you described.For now you will have to rely upon insurance, I don't believe the PM acted unreasonably given the circumstances.

Miraculously, I didn’t lose my shirt, but I broke even on one house and, due to other circumstances, had to walk away from another.

My experience in the last 15 years is that except in the most extreme circumstances, an investor is going to need some of their own capital to make a deal fly.

Quote from @Carlos Ptriawan: Considering the current circumstances, what is stopping me if I create brokerage that is offering buyer agent only with flat fee of 5k-10k ?

It can be located a couple of different ways depending on circumstances.

Talk to your attorney, and if you dont have one, get one - as @Ken M. said, this is highly specific to the state and the circumstances.

With this one I would a paragraph that states " in case of any unforeseen circumstances due to the plumbing, we ask that you not flush wipes or pour grease down the drains "  that way you have stated that in the rules part of the listing.  

To me that is requires major compliments, and the review I posted is not appropriate.They really are going above and beyond in this circumstance and its not fair to them to keep this post online just because I wasn't able to reach them and discuss this over the weekend right after new years.PLEASE reconsider taking the post down.

Sorry to hear about your friend, I have recently lost a deal because of similar circumstance, investor had a death in the family.

Who are great property managers in Atlanta you would recommend for my circumstance?