ᐅ Stone wall made of natural stone or stone tiles? Living room / kitchen

I am not aware of an adhesive like that.

Is it advisable to glue the polystyrene panels onto the wallpaper? That way, removing them later should be much easier since the panels wouldn’t be glued directly to the wall. What do you think?

Since I’ve been visiting the hardware store more often lately, I took a look around. I saw some panels that aren’t made of plastic or at least don’t appear to be plastic, and these seem to be attached only with double-sided tape that is already applied to the panels. Maybe this could be interesting for you?

I would just suggest going there and seeing what’s available!

Adhering onto wallpaper might be an issue if the load is too heavy and the wallpaper then tears off. However, I can’t say if this applies to your surface.

That would be too expensive for me in a rental apartment.
Isn’t it possible to discuss the matter with the landlord, arrange it for the long term (as it could possibly improve the living quality), and share the costs?
Regards

To be honest, as a landlord, I would not want to contribute to any costs incurred. My decision as a landlord would be: if a new tenant likes it, it can stay; if not, it must be removed. Therefore, it should be done in a way that allows easy removal with minimal effort while still looking presentable.

Asking questions is free.