Your loan approval depends 100% on the documentation that you provide at the time of application. You will need to give accurate information on:
Entity Docs
Savings
Credit
The main difference between a DCSR Loan and a Conventional Home Loan is that DCSR Loans are based completely off the profitability of the subject property. No personal info is used besides credit score to determine credit worthiness.
Depends on the type of loan and lender. There are tons of options. I like to think of it as the more risk the lender takes on the higher the cost of the money.