We bought what was called a "show house" about 13 years ago and every room is wallpapered, and very good quality paper. However in places it's starting to look a bit shabby, peeling etc.
I actually removed the paper on a couple of walls in the bedroom, and it was a pain to do. I wet the paper down first, but even after doing that it wasn't easy to remove and there was a lot of glue residue left. So I'm definitely not doing any more myself.
We're considering getting all the paper removed in every room and the walls painted. I don't know if there is equipment that's available to make this easier, or people who specialize in this kind of work, but it would be a big job and probably require us to move out for a month. I guess wallpaper isn't that common in Thailand (Pattaya) either.