As daughter of sea captain always advised cabin forward of engines to avoid vibration noises also higher deck cabins quieter.
And I would always go for an Aft Balcony for the bigger balconies and the uninterrupted views.
If A of N's suggested cabins are full then mid-ships as high up as you can afford then you have less distance to walk to everything. .....Neil.
Having cruised on the navigator, which is in the same family as voyager, we can recomend the promenade rooms, especially 8525, great view of paraes but very soundproofed too.