In terms of the type of investment, multi-family properties often provide more income potential and risk diversification compared to single-family homes, although they might require more management. 

Also want to make sure you can operate your intended types of rental there.

I've looked around and seen people taking $300/month of profit and calling it good – I understand that it depends on the amount invested in the property, but is there a generally accepted percentage that serves as a rule of thumb? 

Typically, it's applicable to certain types of property, and the rules can change.Regarding short-term rentals and bonus depreciation, the Tax Cuts and Jobs Act (TCJA) introduced favorable changes for businesses, including bonus depreciation for certain qualified property, but the specifics can depend on your situation.Using your property for short-term rentals may affect your ability to qualify for certain tax benefits, and the classification of your property (personal residence, rental property, business property, etc.) can impact the tax treatment.The IRS has guidelines regarding the depreciation of rental property, and bonus depreciation may not always be applicable to residential rental property.Additionally, if you decide to switch the use of your property (from short-term rental to long-term or mid-term rental), there could be implications for tax treatment.Given the complexity of tax laws and the potential impact on your specific situation, it is strongly recommended that you seek advice from a qualified tax professional.

@Shak F.Often times is just matter of asking your local lenders for that type of loan.

QuickBooks will allow you to do Mortgage Amortizations, keep track of property Information like land description, square feet, purchase date, type of house, whatever you want QuickBooks to tell you, YOU CAN CUSTOMIZE it to do it. 

The toughest thing might be if you decide to use it as an Airbnb because the "income" of the property is a big factor in determining the type of DSCR lender that you can use.

@Bryant Frazier served in the Marines and been investing for 20+ years now.  

Homes.mil is great for any type of rental.  

They all seem to be regular homeowner type companies.