Well, let's look at the worst case scenario.

Marginal neighborhoods typically still have crime problems, the worst of them involve people who know one another, not new arrivals. 

At the worst, I have had tenants who painted several rooms of a house without obtaining permission as required, and they chose bad colors or combinations that had to be dealt with when the house was put up for sale.

Expect the worst and hope for the best!!

Let's say the worst case happens and you fall off the roof and are knocked unconscious and break a bone.  

Just don't let it affect your view of future tenants, there are some good ones out there and as having been one of them, it sucks when your landlord automatically assumes the worst just because you're a tenant - remember they're ultimately the customer.

What is the worst possible scenario?

well I am a confessed worlds worst landlord.. last winter my tenant in kokomo said they could not afford the heat since it was super cold ( I knew that as well it was brutually cold) so I said no problem don't pay rent for 2 months then just continue.. well they did not pay for 2 months and then moved out.. kind of spit in your face type of charity.As for Green I would suspect there in not one member of the 350,000 BP members that has planted more tree's than me.

However, when the house is done the agent takes the worst pictures known to mankind.

Mediocrity is our worst enemy.