We traveled on the Brilliance of the Seas over New Year 2017-2018 primarily because its was the only time i had available.
A few things to note - cons:
The ship is showing its age a bit.
Not much to say really. It was spacious and comfortable. The only negative I can think of was that deck 11 overhung the balcony and you cold hear the runners/walkers on the track in the morning, but thats a teeny tiny thing.
We just walked around. Nice shops bars and restaurants and is relatively safe.