how to know if it is a good thing paying cash  instead of contracting a loan?

It may prevent them from qualifying for another rental, a home loan, car loan, credit card, etc.

I didn't know Santa Clara County had this loan.

Carrying cost loan (closing costs on loan and interest), utilities, etc can be written off from a tax standpoint to reduce your liability/  

I am looking to connect with investors who are looking for fix and flip, DSCR, and bridge loans. 

Do they do DSCR loans on MTRs/STRs?

Our loan is for our primary address.

Those fields would be relevant if you were taking out a loan on the property.  

Since you have mostly commercial use, you'd most likely need to speak with a commercial lender.The only other problem I am seeing here is the loan amount. 

It depends on what your starting reserves are, but if you have enough for a down payment, I would look into DSCR loans for financing, as you can qualify based on the property's cash flow as opposed to your own personal income.