I will mention this, that if you get placed in a handicap room there are a few things to consider that might be a downside
1. There is no room dividing curtain. So you will all be staring at each other come bed time. Or if one side of the room wants to sleep later, but the other side is an early riser.
2. Handicap rooms in 5e also do not have double bathrooms or a tub. It is a single bathroom with the walk in shower, toilet, and sink all together. So depending on your comfort level with your friends you can't take advantage of the benefits of having the split two bathrooms. However, you can always use one of the public toilets or the controversial shower facilities in the Fitness and Spa area (at the front of the ship).
3. The exterior hall door closes slow. Like ridiculous slow for those who are able bodied.
The balcony is one huge wrap around the back of the ship and you can have loungers on it to enjoy extended balcony space. The room is also huge, so if you want to bring the game Twister on board, you have a place to play.
The only other rooms that could be slightly less disireable at the back of the ship are Flag Rooms, or those on deck 10 for potential noise. You can always ask a note to be filed on your reservation that you would prefer the 5e and not to be upgraded to another category.