Need help on deciding a tenant

[Buyan Thyagarajan]

Hi,

I am in the process of deciding a tenant whose credit score is 556. The wife has an income of 36k and the husband has a used car sales business. They are young and desperate to move and willing to consider a 2-year lease for 50$ less as well. I called their reference who gave a good one as well. I do not have a tenant yet and desperate to get a tenant given that I have to put a mortgage in December. 

1. What else would you consider or should I ask for before I make the decision on the tenant?

2. If they ask for a pet, what should be the pet fees be?

Buyan