I think just removing the wallpaper and and painting (instead of adding more wallpaper) would make a big difference (particularly in the bathroom). Also, I would get rid of the current mirror in the bathroom and replace with a smaller framed type, paint the cabinet and new hardware. Honestly, I think just paint will make a world of difference in your space.

The wall opposite the couch could hold the TV - would need to mount it on the wall and that would take a while as we would need to get someone in to do it (I love my husband but he's not the handiest). Where the photo was taken is a three seat couch, so couches are in an L shape.

I love that colorful floral!! it almost has a 40 vibe, and glamorous - I think it would look great in small toilet, maybe matte gold color mirror frame (and everything else white). The other floral is more retro - I prefer the glamorous florar. For the bathroom, if its a paper wallpaper I wouldn't use it beause of the moisture from showers might have the paper corners come off, and you can't really clean it - so I would skip wallpaper there. I love wallpaper and the drama it gives, but it has it challenges. But I like your choises so far, so you are on the right track. If you do something for the lounge I would do something geometric, and monogromatic more subtle.

Can I make a suggestion: Is is quite hard to gauge the space / layout by the two photo's you have posted. Have you considered adding a picture of the floor plan even if it is just a hand drawn rough drawing.