I would be careful moving in with a couple, because they are a unit and you are not a part of it. What if they will split and you'll need to fill an opening, or two openings? What if they want you gone? Do you think the open area will become their area? Regardless of how good friends you are, that kind of thing can get weird fast.
I think same-sex housing is easier to deal with in general, unless you're married.
Does rent include heat, A/C, water, hot water, gas?
What about phone, cable, internet?
Food, laundry, toiletries?
Anything you might wanna buy ever?
Do you own dishes, glasses, pans, trash cans, can openers, etc.?
You say gas for your car, what about car insurance? Is your car paid for?
Do you have savings for when something goes bad?
For example, my tuition was bumped up like 40% last year, and I didn't plan for that. $500 for summer classes? My summer bill is like $2500, not including books.
How much do they want for a security deposit?
Is there a way to terminate the lease early?
How long, like is it 9 month or 12 month?
Do they require renters insurance?
How late can you be loud at night?
Do they have included laundry?
Covered parking?
Security?
24 hour repair?
Allow pets?
Do they review your credit with a non-refundable deposit?
Does the complex have a good reputation?
Know anyone who lives there?