Vintage Ragamuffin: Renovation: Wallpaper

Late last year my Partner and I purchased a cute inner city terrace house with a generous courtyard. It's in a great location only meters away from cafes, shops and the train. The trade off for that, apart from a gigantic mortgage, was a house that needed some TLC. So we're starting to think renovations. Ever since my obligatory Australian girl living In London years, I've had a real soft spot for wallpaper. I know that not ever one is a fan, but I think the right wallpaper can really lift a room. My idea right now is to do a feature wall behind the bed in our room (are feature walls Passe now? I think so but I'm still going to cling to my idea) My partners a librarian and I love books, so this would be a perfect fit, sadly our bedrooms very small so this won't really work.