Styling a rental without losing your bond
Most rental advice is a list of products. The better starting point is light. Landlord-white walls and harsh ceiling bulbs flatten everything, so fix the light first: warm globes (2700K, always), at least two lamps per living space, and the big light off by default.
Second, go big on the floor. A large rug — genuinely large, front legs of every piece of furniture on it — redraws the room's proportions and hides the beige carpet you didn't choose.
Third, lean things instead of hanging them. Oversized art leaned on a console or the floor looks intentional and costs you zero wall damage. A leaning mirror does the same job while bouncing your newly-fixed lighting around the room.
None of this touches a wall, and all of it comes with you to the next place. That's the real rental strategy: invest in things that move.