You have the mortgage, taxes, insurance, maintenance, capital expenditures (roof, flooring, etc.), and also need to consider the cost of vacancies or bad tenants.I also recommend you charge market rate, for yourself and the tenant.

Keep in mind that property owners have experience significant hikes in their costs as well (property insurance and property taxes). 7.

Ended up with negative cash flow due to replacing an air conditioner. 

The bank statements has deposit showing gross pay from the pay stub and not the net pay after taxes.

Never heard of him.Make sure you perform proper due diligence.

Even the most meticulously crafted plans can frequently go off track due to unmet responsibilities or unforeseen events.This is the essential characteristic of the real estate industry.

And if there is a "why" then the 1031 is what you want to use to get into a new property and defer all tax.  

Emphasize that this was due to the guest’s actions, not an “act of God.”If escalation doesn’t work, consider sharing your experience in Airbnb host forums or on social media to get their attention.

Are you having issues with tenants paying the remaining 30% of rents due?

If the tenant misses a payment the full amount becomes due.