You've read many of the negative reviews regarding Royals layout, for me the disappointment was the lack of a Promenade Deck, however, Regalt is designing it in. Yes, the central staircase would be nice, but not an issue and the elevators weren't a big issue after day one. Mind you I prefer using the stairs.
The crew was excellent, very friendly and willing to do what they could to help. A bit above other
Princess ships I've sailed on. The overall layout was pretty nice, however as the new flagship well I prefer the design off the Grand class and the older Panamax ships (Island & Coral). The number of passengers on board was not an issue, like most ships the chairs are "reserved" with towels early, but we had no issues real issues there either, typically finding a place after breakfast.
Nice room, bathroom designed nicely, balcony a little smaller but fine.