Only additional comment is that there are non bank lenders who have a higher risk appetite (and of course interest rate) on business lending if this is something you want to explore. If you google small business lending there are a few good options that come up.
I know you talk about an unsecured loan above but if you have personal assets you could choose to secure the loan over these personal assets initially and once the business is up and running you could refinance the loan over the assets of the business or it’s performance.
You don’t mention how much you are looking for- do you have friends/family that believe in your dream to that could share the load with you?
And I agree with Peter- if you don’t ask you won’t know!
Best of luck- it’s a great idea and one I just gave as an option for another cafe owner!