Last time we cruised, we notice those cool looking balcony rooms next to the small Terrace Pool (aft) near Horizon dining area. There are two on each side on the Riviera floor. We always get a balcony on that floor but usually it is near the center Starboard side (around 607). But this time, we decided to try a rear balcony. BIG mistake.
Normally, we spent about an hour a day (or more) on our balcony reading, snacking, watching things go by and I love to go out late at night and read. This time we spent about a tenth of the normal balcony time out there. Most of the day, the sun was beating down on us. If the sun wasn't there, it was raining OR even worse, someone above will wash down the upper deck and the water comes right down on our balcony. I sat down on what appeared to be a dry chair several times and my shorts were soaked!!! We finally learned to keep a towel handy to sit on whenever (which was rarely) we sat out there. Also you will get toothpicks from folks hanging off the rails above dropping them "overboard".
This trip also had a lot of rough seas so the door kept sliding open whenever we were outside!! Imagine hearing that door open and close, open and close, again and again......just not worth being out there most of the time.