Here are some steps and resources that may help you confirm your numbers and conduct due diligence:Rental Income Analysis: To determine the possible rental income for your duplex, look up the rental rates for nearby homes that are comparable to yours.

Rates are too high, so borrowing costs are high.

HMLs offer quick funding, but keep in mind the higher interest rates (8% to 18%) and shorter repayment terms (6-18 months).

As far as a general STR strategy, a nice 3x2 house within an hour of a major attraction is not too much to manage and can drive a nice nightly rate if you go with high end design. 

Just a quick follow up to @Christie Gahan's comment: ** Yes, Long term capital gains are taxed at lower rates, but it isn't as simple as the first $500K of gains are taxed at 15% -- rather, the 15% bracket will account for your total income from all sources. 

@Yael FuerstIf they are rentals you could get a DSCR loan.If the loan you get is lower interest rate than the current loan amount then it makes sense to do thatFor example if your debt is 10% and a DSCR loan is 7%, then pay the lower interestHope that makes sense

Recognize market trends, rental rates, and property prices.

Their labor rates are way below market rates so don't expect any big name established company to show up. 

@Ethan Swat have you done the math to calculate the increased booking volume or higher booking rate is required to break-even on the investment?

When interest rates were lower there were more deals to be had and cashflow was solid with even a moderate down payment.