The Harmony of Seas is a gorgeous ship. It was our sixth time sailing on an Oasis class ship -- and our 11 RCCL cruise overall. It was my husband and I, our 20-year-old son and his 21-year-old friend (two cabins).
There were problems.
1. Activities on the ship were scaled back -- very few trivia games, no scavenger hunt, scant movies or other ways to pass our time on sea days, other than spending more money at the spa or other upsell activites. In addition, the activities we enjoy, such at sexiest man alive and belly flop, were moved from the Aquatheater to the sports pool. That meant the people lounging at the pool all day had prime seats, while the rest of us had to struggle to see what was happening. An ongoing issue, as well, is towels left on chairs in the solarium. RCCL needs to monitor that so empty chairs don't go unused for hours.
On our six cruises on Oasis class ships, we always stay in this same room. The location is ideal -- toward the back of the ship, easy access to Aquatheater, boardwalk, promenade and Central Park.