At that class of property, the turn overs are costly. 

Like any investment, there’s a learning curve—understanding which properties qualify, accurately estimating renovation costs to pass inspections, and managing typical real estate risks.Having a reliable maintenance and management team in place is key to long-term success.

Sell your investment property and buy the land for your business. 

I got 800+ credit and great mortgage offers so only reason im doing this seller financing idea is that its lower monthly cost

The truth is, they will keep playing games and milk you for every penny they can, then they will leave the house a mess and cost more with cleaning, repairs, and vacancy.

Can try to reposition to Class B, but neighborhood may impede these efforts.Vacancy Est: Historically 10%, but 15-20% should be used to also cover tenant nonpayment, eviction costs & damages.Tenant Pool: majority will have FICO scores of 560-620 (approaching 22% probability of default), many blemishes, but should have no evictions in last 2 years.

Quote from @Joel Oh: Your business must make money day 1.It is so much more difficult to fix the model that is not making money than starting a new business that makes money day 1. 

Without this workout, the down payment requirements, current levels of interest rates and cost of the transaction would not be incentivizing enough to for investment. 

Also you should inquire with insurance agents about the cost to insure.

I would say it depends on the cost of the STR.