Just returned from our cruise on the Caribbean Princess, a pleasant enough experience EXCEPT our unfortunate cabin selection. We were in a Balcony (BB) on the very rear of the Emerald Deck. Unfortunately, that is directly above the sound system and speakers of Club Fusion. Our entire cabin vibrated with the thumping of the bass non-stop until 1:00 AM. We bought ear plugs, and managed to stay out in the casino or clubs until the wee hours to avoid the noise (it was REALLY loud) but for cruisers looking for peace and quiet or an early bedtime, you do NOT want this cabin.
I'm glad someone else has said this. We were in cabin E720 on the Sapphire Princess and had the same problem. I suggest writing a letter to Princess, they sent us a letter telling us they have given us $300 credit each for a future Princess cruise.