Flounders worked out great for us on the Westward Repo. There were fewer than average number of infants on board, and a couple of times, DS was just NOT going to make it through dinner. Each time I was able to take him to Flounders without ANY reservation and they were able to take him (your milage may vary).
I also count our selves lucky that DS enjoyed the nursary. Generally speaking, parents here in the forum indicate that infants older than about 2yo don't usually enjoy the nursary claiming it to be geared more towards the infants (i.e. 1 yo).
We didn't have DS in the nursary often during the repo, but we never once got paged. Acctually, by the end of the cruise, he was doing so good in the nursary, the staff would take him without even bothering to insure we had a beeper.