I know hosts have included additional cleaning fees for violations as a deterrent.If none of these solutions work, you could look into completely independent HVAC systems for the two units, though that would be a bigger upfront investment.

What's left after all that is your cash flow.Collecting cash flow to spend is an amateur play.

I have S8 rentals in Detroit where the rent is a fair bit higher than I would be able to get with a cash paying tenant. 

Cash available: 100k

Why not joint venture with someone who has money, fix & flip itWhy not rent it out for at least the monthly carrying costs.Why not sell it on a lease option, get 10% cash up front to fund school? 

I funded this with US cash, as well as a loan with a Canadian bank.I have shared this process with many friends and other real estate buddies that commended my journey.

Second to cash in the bank is HELOC cash because you can use it however you want (you just have to see it already in an account).

Stack up the cash flow and dip into that as needed to support the asset.

If it sold for $120K in 2007  , and your rent is $2000 a month , the landlord is probably cash flowing rather well .   

The real issue you should address up front is what does the seller want?