Some furniture places (for a small fee) allow you to buy now and pay within 6 months interest free. 

So really selling lease plus furniture.

And my wife wants all new furniture of course so maybe I do a furnished rental ???

I know in my tiny village three business owners recently received grants $100K (think they match) for outsideimprovements (windows, parking, roofing, patio)  Must be nice; that's what I want! 

Is the garage big enough to have a full queen bed in there with some furniture for an extra sleeping area.I would also add the PS5 or maybe a Switch or Wii?

Without a hot tub, or a swimming pool, or a back yard patio you aren’t offering anything but a place to sleep.

Check for burn marks Burn marks on furniture, countertops, or carpets are a clear sign of smoking.

The largest part of the bill not covered was the moving of their furniture in and out.

Otherwise you spend year 1 paying yourself back for the furniture (if you're lucky) and then hope to make a profit in year 2, only for your lease to possibly change terms, losing all of the time you put into building your brand.

Basically you need to be able to pay a large part of a long-term (multi-year) lease up-front, then still have some cash for renovation and interior/furniture, to finally recoup the investment through STR and a hopefully very quick way.