The Rewards that slow decay on a need are all pretty powerful, but Never Weary literally means no decay on energy. It's pretty overpowered.
Kitchens, Computers (for writing), Easels, and Instruments can all be shoved in one room if you're tight on money and want the Inspiration+ aura to buff them.
Easiest way to farm rewards points that I've found is to stick a shower (for brisk showers), a computer (for work-out research) and your exercise equipment in one area. Also decorate it and throw some crystals on the floor (or any other energizing decor). Get energized and reroll any Whims that aren't work out related or involve a gym.