@Zaffre You got it right, I’m a current student.
I am very very far from an expert on NU housing, but I’ll see what I can dredge up from my memory. You should really get other answers to the question, maybe by posting another thread about that theme.
I don’t know of any dorms with closed suites, or at least none available to freshpeople. Dorms usually have only one type of housing ([open] suite or traditional with bathrooms for everyone in that part of the floor), I think. CRC and ISRC have suites, and Willard and Sargent have traditional layouts. I was in the other dorms either not frequently enough to remember, or not at all, so I can’t say definitively one way or another for them.
I don’t know of any dorms with bunk beds.