We enjoyed a 5 day round trip from Barcelona on a recent Europe Cruise. It was our first RCCL cruise. We are a family, two adults in late 30's with a 2.5 year old. To make it easy, I'll segment the review into sections.
Room - our balcony was lovely. We were on the 6th floor, probably 2/3rds of the way towards the back - no noise, no movement. We thought the balcony was a very good size, perhaps bigger the HAL and Princess balconies. Our son slept on the couch, prepared as a bed each evening. Very happy with the room. Amenities such as soaps, etc are limited, but no big deal, take your favourites anyway.
Kids Club - our son loves playing with other kids and different toys, so he couldn't wait to get to the kids club. As he wasn't yet 3, he went into Royal Tots for $8 an hour and loved every second. The staff were so nice and our son would ask when he could go back, whilst we were picking him up! We utilised this service for a few hours in 2 ports and for one night to have a special dinner. The staff are so flexible and let the kids play, sleep and fulfill your requests. This was a big pro for RCCL, well done.