Last I was in there was to help her clean it up and paint before these tenants. 

You might run into an issue if the damage is so bad that it effects the intergrity of the building.

However the typical FSBO seller doesn't do this for a living so they really just don't know how to get a deal done clean and neat, and compliant.  

Recent changes took effect August 1, 2018 regarding laws for rental properties in Baltimore City.

There have been no changes in flight path that effects this house but some of the comps are in mapped noise zones right under the flight path. 

But they said they still have fleas.At this point, I feel like it is fairly safe to say that they brought the fleas in with them or at least their cleaning habits (or lack thereof) have contributed to the problem.Anyway, my question is who is ultimately responsible in this case? 

I am building capitol to flip myself and think it makes more sense to make sure you can have as clean an inspection as possible.

They are now clean, according to their Instagram, or Twitter, or whatever.What goes through your mind, and how does it play into your overall evaluation?

The offer was quickly accepted and the roof replacement cost was effectively rolled into my loan. 

***DISCLAIMER*** I Own & operate a cleaning business.