Room List so far(no you cannot change your rooms. unless you're allergic to your roommate. which you won't be.)

[b]Floor 1[/b]

Room A
Abigail Blanchett - Leos

Room B
Mathias - Lynnette Baines

Room C 
Isaiah "Izzy" Akele - Cameron Melissa Elm

Room D
Nikolai - Kaede Max