We have sailed with Royal Caribbean previously and it's always a very enjoyable trip. Their service is always phenomenal! Our room steward, waiter and assisant waiter were attentive and added so many personal touches. They made it so enjoyable for our daughter and were so sweet to her. We loved them!
We sailed last year on The Liberty of the Seas. The Navigator is a bit smaller but is set up very similarly so it was very easy to find our way around. The Liberty has a bit more to do and sometimes we felt overwhelmed and like we had to fit it all in. So the Navigator was nice if you are really low-key and like to just relax at the pool on sea days.
We had the later dinner seating and on a few nights we had to go to the show before dinner. Would have preferred to go after dinner as there wasn't much to do after dinner for families. We also weren't really able to use Ocean Adventure club for our daughter because by the time dinner was over we usually just decided to go to bed. Plus it was into the time frame for which you had to pay for the childcare - we couldn't get her there in time after dinner for the regular hours.
We were in cabin 1534 located on deck ten, forward. It was a great location near the forward elevator and just a few doors down. It was quite, clean and comfortable. Our room steward, Claudio, was amazing!