Thanks for your reply I'm glad someone else agrees that it seems weird to be all alone at night like that. It should have said in the job description that they were actually looking for a front desk person/housekeeper/bellman/lifeguard! I still might have taken it but I don't know if I would have lasted.
The agency called today and they are still working with two companies trying to set up an interview for me - they are both in factories but the job itself is something I think I would be really good at, but I'm going to keep looking for non-agency positions just because they often come with less hassle (plus these two companies are really far from where I live).