There were a lot of things Rhys was expecting as he explored the ship — and this was definitely not one of them. It might be one of the things he expected if he was actively trying to look into the cabins, but he wasn't doing that since he still had a concept of privacy.
And also, he truly thought that Commander Olga was calling for him and telling him to enter the cabin, because she was… it just wasn't exactly directly directed to him… but rather a photo of him.
Commander Olga's cabin seemed to not be any different than the others; Rhys wouldn't know, of course, since he hadn't seen the other cabins yet, but with how simple her cabin was set up and the fact that the bed was a bunk bed, it was safe to assume that she did not allow herself to be given extra treatment.