you can get financing witha  LLC but the lender will require a personal guarantee on the loan.

Guaranteed value appreciation or maintenance.Although you said you don’t mind high risk.  

Using automation can certainly help at scale for easy things, but if you have one STR and can't be bothered to respond promptly to your guest, I can guarantee this business will not go well for you.

However, while I was still getting contractor bids for different projects, I found 3 different companies that are quick (based off of their contracts and guarantees) and have good quality of work (based off of previous and current investor feedback) but come at the cost of price.

This virtually guarantees increased cash flow.- equity pay down is guaranteed.  

In order to submit a deal, you have to put in a lot of work and there is no guarantee they will buy it.

Either way if you personally guaranteed the note, yes it will affect your personal credit no matter who the property is titled to.

Where I live there are many benefits to the voucher program in addition to guaranteed payments. 

And, past performance is no guarantee of future results. 

We use private investors and offer them 20% APR, with 10% return guaranteed, paid as a balloon.