Oh, I think you made the right decision. My mother-in-law always insisted on sharing rooms but I put a stop to that in recent years. We all have different wake up times and bed times and it was annoying having to deal with all that. Plus, the most senior folks in the room seem to get their way most of the time (out of respect, not because they demanded it) so my husband and I would just have to put up with their schedules and routines and it was frustrating.
The trip that put my over the edge was when my mother-in-law insisted on having the coffee pot next to the bathroom sink. I had no room to use the hair dryer and she didn't understand why I needed to wash my hair every day. But she didn't want to move the coffee pot. I lost the battle but won the war when next trip I said we needed two rooms.