Agency as an employer?

Hi guys,
if you can shed some light here, I would appreciate it.
Ok here it goes.

Would it be a problem with the consular interview if I don't have a contract with a hospital?
Well my pay checks (as the agency claims) will be from them and not the hospital.
I am having doubts about it, since some say that it would be problem if the PD gets current since the consul officer will be looking for hospital contract and not the contract between the nurse and agency.
And $30 per hour salary for New York? How is it? Is it low or what? They promise a $5 increase after 1 year of employment. The drawback is, they don't offer free housing even for just 1 month.
So you could please help me with these.