Quote from @Tim Silvers: Quote from @Tom Gimer: The fact pattern states the equipment was leased (owned by the solar company, not the property owner). 

Hardly anyone buys the travel insurance but so far only one guest has left early due to smoke.

They claim they are religious (he is a youth pastor) and don’t smoke (but they look like the do) and image wise are tatted from head to toe and don’t come off like they say. 

The facility is underperforming and it should be a good opportunity to buy it while the price is "low" (asking $40 million, with a solar farm that is currently being installed) before the "Silver Tsunami" hits over the next few years.  

VAs aren't a silver bullet to solve poor processes.

Anyone using the Minut noise/cigarette smoke monitor? 

Smells of cooking or smoking are likely to do so as well.Having said all of the above, the flats I'm familiar with have rented reasonably well at market rents.

They dislike the new tenants in front and have complained about smoking (not allowed) and loud fights.

To add the unit you will most likely need to achieve proper fire rating between shared walls/floors/ceilings and have interconnected smoke detectors.

Requiring renter's insurance (separate from your property insurance) is also very important since they typically would not have the cash reserves to pay for a major damage such as water damage, ruined floors, fire/smoke damage, and you will be sued by 3rd parties if something happens to them while at the house if they have to go to the ER.