Again, your not totally eliminating your tax. 

The hydrogen peroxide should remove any stains and eliminate the urine odor.

As you found, the cost at most places is so much that it eliminates your cashflow for the year.

Sandblasting was $50 and it eliminates the need to do something to the exterior. 

In my state, I would go to court to have the place declared abandoned and be awarded possession thereby eliminating this risk.

The goal of a househack is to eliminate your housing expense as much as possible.

Says the humidity is 60% so she bought a dehumidifier and odor eliminator plus activated charcoal to help with the smell.

- househacking is really designed more to LOWER your personal cost of living vs eliminating it, let alone cashflowing. you CAN achieve cashflow, it's just harder. look into STR'ing or MTR'ing some of the units. - i personally think 2% for LTR vacancy works in most markets.- the rest estimator doesn't work well in less-populated areas. i use facebook marketplace to find 5-10 comps and average them. - COCR isn't as applicable with househacking because of my first bullet point & because it doesn't factor in that you're also saving on your personal cost of living. many investors shoot for 10%+ COCR with a traditional rental property that they're not househacking.

I would like to eliminate the customer from my work though.

Even something as simple as adding your cleaning fee to your nightly rate will eliminate a lot of the worst guests to deal with and position you as more high end.