你很厉害的嘛，back room很常用。
back room：的意思：
1 : a room situated in the rear
2 : the meeting place of a directing group that exercises its authority in an inconspicuous and indirect way
即：后房、里屋，密室（进行秘密活动，比如指挥、开会，存放档案等的房间。
secret room同样行。
看具体情况bubble也能用：它指的是“为防电子窃听而用透明材料制成墙壁的玻璃密谈室”.
例句：
As soon as the party arrived, at the US Embassy, the Secretary of State said,"Let's go to the bubble."
代表团一到达美国大使馆，国务卿就说：“咱们进玻璃密室去谈吧。”
机要室
confidential room
Chamber of Secrets（哈里波特与密室中的用法）
or
black room
secured room?
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