Open a business bank account?

[Ryan Busby]

Hello fellow investors!

Three days ago I closed on a duplex - one unit has two years left on a lease and I will be living in the other unit (house hacking). 

I have two questions:

1) Should I open an LLC, even if I'm just renting out a single unit?

2) Should I open a business bank account for all rent and expenses? (If so, any suggestions on a good bank to go through?) 

Thanks in advance!