It’s a dangerous world when it comes to old wallpaper!
I’m okay if it’s well adhered; it can work like “Glidwall,” hiding the cracks in the plaster. Once it starts to peel back, though, it’s often hard to know when to stop taking it off. Many of the rooms have a few layers, so they’re fine, and I leave it alone. The second floor hall and third floor were a different story.
The two rooms on the third floor were painted blue. The back room had poorly adhered paper, which I easily removed. The front room was tough to remove, so I left it, except around the cracks where it was easier to remove.