My employers took our management staff on Harmony of the Seas as a reward for a great year and having sailed with Carnival in the past, I was told the RC was a billion times better and that I would have the time of my life... Not exactly the case.
It is truly a beautiful ship and I loved several things about it, like Central Park, the cabin, the boardwalk, etc. But it was sorely lacking in other areas.
The Cabin: IT WAS AWESOME! I decided to take my grandmother as my plus one, so there was plenty of room for the both of us. We had an ocean facing balcony and it was gorgeous and so peaceful. Sometimes in the evenings, because we were on the 14th deck, the music from the 15th deck would get loud, so don't expect to sleep out there. But the bed was perfect and the bathroom was spacious. Overall, excellent cabin.