We were in L217 last month, no noise to report and only needed earplugs in when the weather was a little rough coming back up off the coast of Portugal, just a little banging when the waves slapped off the bow. Your high enough up that you shouldn't hear the noise from the stabilisers, go down to Ramblas on a rough day and you will know what I mean.
We were on the Starboard side but the ship went usualy in on the port side. Only time this didn't happen was in Gibraltar. So the balcony was quiet. Because it was up the front it could be quite windy on sea day's, not sure how it is in other parts of the ship.
We had fun anyway.....
Thank you .