Final answer:
The author does not like the room due to its confinements and lack of preferred aesthetics, contrasting with her desire for a brighter, more open space downstairs. There is no explicit mention of a preference over a sibling's room or sharing the room with a sibling.
Step-by-step explanation:
The author's descriptions provide a vivid image of the subjective experience and emotions associated with the room in question. We understand that the author did not share the room with a sibling, as is made clear by the desire for a room downstairs and the lack of space for two beds. The narrative reveals a sense of confinement and restlessness regarding the room, contrasting with the yearning for the more open, floral space described and indicating a lack of true fondness for it. Given these details, it leads to the impression that the author did not have a strong dislike for the room, but rather a complex blend of discontentment and resignation, particularly due to the imposed restrictions by John.
The commentary about the room also does not suggest any direct preference towards a sister's room, as that aspect isn't mentioned explicitly. Finally, while there is no direct mention of spending a lot of time alone in this room, the imposed schedule and limitations on the author's movements within the space might imply a significant amount of time spent there in solitude.