I am considering doing this with a 0% APR credit card to avoid a loan. 

Don’t forget heloc, DSCR, 2nd on primary, borrow from retirement accounts, credit card cash advance, property reserves, home improvement store credit, etc etc.

It's likely a scam anytime they sound like AI or the grammar is weird or they use the word "kindly", if they ask for you to respond to them off-platform, if they say their employer will pay for it, if they ask if the dates they've specified are still open (when they can clearly see they are open on your calendar), if they ask for a video of your property (they probably want to set up a duplicate listing with your photos and video and scam others out of money), or if they want a long term booking and they have just joined the platform and have no reviews (could have been evicted from somewhere else, and hope a newbie will let them in with no background check, they'll end up not paying or credit card is bad).  

It gives you the flexibility kind of like a credit card that allows you to borrow a certain limit and withdraw funds as needed.

Real estate takes many years to be able to support yourself, and that’s if you do everything right and the cards fall into place.

It will likely still continue being a difficulty.You mentioned bills, are they credit card bills?

FYI, it has a free 30-day trial that has all features and doesn't require a payment or card to start using.https://www.rentalhero.io/

I stayed on their "a@@" for weeks and pulled the we are getting a lawyer card.  

BTW there is a free trial and the Starter monthly plan is $119.It also allows you to search through consumer information such as property owner "credit worthiness," Credit card usage, buying power, age, language, family members in the house, and many other fields that are above and beyond property characteristics, which is unique.

To answer your questions here though:Alternative options - I was going to sell all my stocks and etfs, take out a HELOC, and some credit cards to try to shoestring together enough to the deal without a hard money loan.