typically with seller finance there would be some period of monthly payments and then a balloon where you pay off the balance in full. 

Low down payment (3.5%) is attractive, but comes with mortgage insurance and might not offer the best rates.

Do you mind expanding on how you attained closing cost and down payment?

Booking.com tends to be more hands on since you have to setup up a payment processor and take payments from guests.

I'll looking forward to your immediate response.Please resolve this issue ASAP, our tenants have already submitted the rental payment to your Appfolio account $49,987.00(attached report), however it is NOT showing this amount in your account at all, not even mention transfer the fund to our BOA account.

Were I am getting disappointed is the lenders for Commercial say you need 20% down payment (I don't have that) and when I tell them if I could have Seller finance in the same deal, was told no.

You can collect payment directly through airbnb or collect it through your payment processor (mine is Stripe) on your direct booking website. 

Are some banks better for mortgages than others (in terms of down payment, interest rate, length of mortgage etc.)?

Most sellers only care if you close so you can usually use another form of capital stack other than what is on the agreement, however, the seller can force you to use the originally agreed-upon payment method. 

All you need is a single place to track tenant information, payment history, maintenance, and other things.