Furthermore you can vastly increase your returns through leverage using a non-recourse loan but that will definitely trigger UBIT but again the numbers can still make a lot of sense. 

Just make sure you are saving towards those slow months during the peak months, buy a deal at the right price (don't overpay just because its a turnkey STR or you think it will make more money than projected), and look into ways to increase bookings during those slow months with some marketing and operation tweaks. 

I did most everything I was supposed to do, increase my income, decrease my living expenses, save cash, etc.. 

They had an unfinished space counted as finished space increasing the size of the home by ~10%.

While less than 10% of the mortgage industry offers 40-year mortgages, here's something to factor in: they often come in with a rate increase of 20-35 bps.Assume 35 bps.$300k mortgage at 7.25% (30-year): $2,046$300k mortgage at 7.6% (40-year): $1,996Technically, it lowers the monthly, but not by much once factoring in the rate adjustment.

If you spend time learning how to manage well, your income will increase, you'll save time, and you'll maintain your sanity with the courage to expand.

As they see their money is safe and you're succeeding with your plans, they'll usually ask to increase the amount of money they loan to you.

I like the cash flow and see the potential for increasing rents, but I’m hesitant about overpaying.

You could consider the areas in the city with the highest value increases.

In some homes planting the front or placing pots could increase the curb appeal, in others it could be paint or furniture etc.