How about warm yellow? I think it will go together with bricks and would be a good contrast to dark floor and black cooker. Yellow is an optimistic and cheerful colour and often is associated with food. /Marcin

Thanks Daisy, yes, must be from a cleanliness point or view. He also said to have something solid there. The tile shown is a matte 120*60 porcelain tile - it’s going on the floor and shower area (the walls perpendicular to the toilet wall shown) I was also thinking I could put a different herringbone style tile on the toilet wall - green pic below or even go up half the wall with either tile

I think you can get freestanding ones that look like sideboards and hinge open on the longer edge. Alrernatively, you could get a daybed that extends out to a twin.

If you must, only one wall. If doing two walls you should do all four walls. Two walls doesn't make sense and just looks like a half-done job. To make it a proper feature rather than a randomly wallpapered wall, it should be the wall behind the bed, so I'd finalise the bed position and then do the appropriate wall. If you do the 3m wall and keep the bed on the 4m wall, it'll look like you wallpapered and then realised the bed was better on the other wall i.e. it will look wrong - unless that wall then becomes a different purpose which makes sense (like aforementioned study for example).