accent wall?

i always get my craziest ideas at night, especially for someone who's a renter. i was just thinking about wallpapering a single accent wall in my home (a small but central one) with paper- maybe something subtle but modern from cole and son or mibo. clearly i shouldn't do this with a rental, but that aside, if i was to do this, how hard would it be to get down (on say a 10 by 7 foot section of a wall) when i move out (or paint over?). also, our walls are pretty old and uneven, is wallpaper a nightmare of an idea if you have old walls? any advice is appreciated. xo, the wallpaper novice (aka, d*s).