Soldato
Sadly, wallpaper is sometimes a necessity in older lath and plaster housing, due to all the bumps! Skimming over lime plaster is also pretty much a waste of time, as it just never takes properly. You either wallpaper (cheap) or it all comes down (messy and expensive).
Oh yeah, our old house had horsehair plaster and you could actually feel it was only the wallpaper holding it all together. We'd have loved to remove it and replaster, but the amount of mess/work would've been huge!