I lived in bridges last year and personally know most of the JCRC there. I suggest that you all get to know/love Chris, the JCRC president.
With regards to the rooms. Most catered rooms have hand basins although not all. There are some single sex corridors however there are also some mixed with separate male and female bathrooms. Dont know if you've been told but you all need to take your own bedding as the hall no longer provides it.