Classic 30 year, fixed rate loans.

"Buy the property, but date the rate!".

Each property comes with its own set of risks and every investor must understand those risks and do the minimum - get 3rd party inspections, 3rd party appraisals, verify rents, jobs  and crime rates at city-data.com - before buying.

Section 8, student rental, market rate?

Quote from @Glen Wiley: I am not a big fan of those rules - I think they are too simplistic.What will your interest rate be?

For those who are charging higher nightly rates, where would you say your rates are vs comps to try to weed out the trouble guests?  

While not impossible, you'll be paying a much higher interest rate for the loan than with 20%+ down and also you're likely paying some points or splitting the profit if for resale. 

Quote from @Paige Corsello: Hi Bobby, the majority of my business is in Pittsburgh, PA and Florida Paige I can go 80% cash out in PA In FL I can go 75% cash out and 80% rate and term

In Philadelphia where I am located the going rate for this service is 1 month's rent.

Once that extra rental started generating income, he realized the higher interest rate was just a temporary hiccup on the way to bigger returns.In your case, maybe look at a structure that keeps your best cash-flow property on a lighter refi (say 50% or 60% LTV) while you go a bit heavier on the one that’s not producing as much right now.