If so, does anyone know of a lawyer, who can sort this out with a quick phone call to Airbnb?  

Your question is a very common question, and I can appreciate your concern here.

If you get complaints, remind all parties that noise travels, they were warned to be quiet and respectful of their neighbor, and that repeated issues may result in removal.I have an apartment building where the downstairs renter can hear the upstairs neighbor talking on the phone when it's really quiet at night.

Then I texted his cell phone, using the phone numbers displayed in the email Brian sent me.

Quote from @Frank Nguyen: Frank, this is a common tactic.

These are done between the buyer (you) and Seller.The situation that is most common to find these properties are in a foreclosure proceeding, or pre-foreclosure. 

Usually, it will be allocated by price or sq footage or something that is a common factor by your accountant.If you use the purchase price then 46% of the basis would go into the 170K house. 

It's very common for buyers to get nervous about sewer line issues due to how costly the repairs can get.  

Wanna know what they have in common?

See if they answer the phone.