I’ve only papered a small bathroom with all the walls. My living area is open/broken plan so not suitable for anything except accent walls
I’ve one bedroom with an accent wall and it’s a small double bedroom with not great light. I wanted a dramatic wallpaper which would have been overwhelming if I did every wall. I think either quite large rooms or very small rooms lead to being fully wallpapered especially if they have nice wood details that can be a contrast.
I live in a 1970s bungalow so the rooms aren’t big and I want to make them seem spacious and light so accent walls in general look better. However I am thinking of papering a single bedroom fully for my child. I’ll have to be careful with the pattern though to get something that will grow with them and still be fab