I recently sailed on Harmony of the Seas. Although I didn't mind the one time per day room cleaning, I wasn't prepared to not have a choice of morning or night. (We met the room attendant late afternoon on the first day and he told us he could only clean our rooms in the evening around 6 p.m. (our dinner time). I told him I prefer morning but was told all the slots were filled up already. Apparently we didn't run into him earlier in the afternoon so we had no choice.
I was a little annoyed by this bc I hadn't heard of anyone being told they couldn't request a time period. We made it work but it wasn't ideal. (I made the beds myself each morning bc I like the bed made and it seemed silly to have him make our beds at 6 p.m. just for us to go to sleep a few hours later LOL )
