There are also additional costs of operating and maintaining an LLC, like separate bank accounts, annual report filings, tax filings, etc.2.

I have a large lump sum saved in an investment account for down-payment and any additional costs.

I'd hop on Airbnb as a guest, search the area the potential property is in, and find some properties that are somewhat comps (similar location, amenities, size, etc.) and connect with the host hosting the property.

I was heavy in RE but sold most in 2021 and appreciate the simplicity of a Vanguard TSM account as I head into the last 5 years before retirement. 

deposited in a demand deposit account?  

Alternatively, you may want to consider switching to a platform that offers this level of transparency.Additionally, on both Airbnb and Vrbo, if you have access to the account, you can view the transaction history.

-when you say "multi family," what size?

There are several other issues (undisclosed maintenance markup fees, excessive charges to our account, significant reductions to agreed rent without communication, etc).

However, I got caught up during creating my listing because it looked like I needed to have another account (Stripe?

So if your interest payment is $1000 then the servicer automatically ACH debits your account that plus the servicing fee (assuming you set up automatic payments as @Christian Ehlers suggests).