How would you sound and probably smell proof the toilet that is next to the living room

We want to refurb this small toilet next to the living room downstairs. What are the best ways to sound proof and smell proof this area for obvious reasons.

Right now if someone takes a piss you can hear it through the walls 🥲🥲🥲. And because it’s right next to the living room the moment you open the door and enter the living room it lingers a bit of smell.

Basically the placement of this toilet is terrible but not ready to completely change its location due to cost. It’s a new property and wasn’t our choice for placement.

Any thoughts appreciated.