The room is somebody's temporary home is the correct answer.
Explanation:
At the beginning of this paragraph, the speaker mentions, literally, that "the only completely stationary object in the room was an enormous couch", meaning that anything or anyone else could be changed. The speakers mentions "two young women" whose dresses where white, and the words the speaker chose to define them or their environment are also related to movement, such as ripple and flutter. Looking at these two words, it is also important to mention that the actions are not controlled by a human power (at least not ripple), which could be understood as a permanent movement from one place to another.
