Once, somebody older from our family mentioned that the sofa bed wasn't that comfortable if you sit for a long period of time in it.

Negotiate longer lease period with purchase option. 

Long-Term Wealth Building: Holding onto the property can contribute to building long-term wealth through both appreciation and rental income.Cons of Renting: Property Management: They’ll need to manage tenants, handle maintenance, and deal with potential vacancy periods.

The best part is there is no ownership seasoning period with one of these lenders and they don't report to personal credit.

You can create a trust to pay you out $5000 a month for a 39 month period of time.

We are wondering what would be the best option to do with the property during this 6-7 month period, whether that be Airbnb or what other short term rental options might there be that could make more sense?

If it is a credit/equity line, you could provide a lender letter that the funds are available immediately for funding - and cured any recission period. 

You Open Escrow, deposit your Earnest Money Deposit and your due diligence period starts (unless otherwise written into the contract). 

Since you have no debt, you can weather a period of vacancy pretty easily.  

The fund could essentially pay no preferred return/dividends to the LPs (Class A Members) during the holding period and then upon a Capital Transaction the GP (Class B Members) would still be entitled to receive 30% of the distributions, simply after returning the LPs initial capital contributions.