Birthing Center Tour: what to ask?

On Saturday my husband and I will be touring a potential birthing center. A couple of weeks later I have an appointment with a potential OB/GYN. I can’t shake the feeling that I am starting on this search way late but it couldn’t be helped, with the move and all.

I feel even more unprepared because I am not sure what all to ask the staff there. What questions did you ask your hospital/birth center? What things did you look for in your OB/GYN?