If there is enough room for a rectangle shower you would really benefit from using the space that a curved shower leaves... something like the attached is what I would do with this. Never been sure about the value of a wall hung WC however.

Thanks a lot all. Caroline I love your renderings, thanks so much for your time. But unfortunately our kids (mainly the older one) doesn’t play alone on his room so we need the toys in the living area :/ I’ve thought about some of the other combinations before but there are some problems: piano cannot go next to the radiator, and TV cannot go on top of piano cause then it is too high. The wall next to window has a stupid shape but we may still be able to move the piano between window and patio door, and take the toys next to fireplace. I didn’t want to put TV on top of toys initially because of the risk of damage by our careless kids and their potentially careless friends. It’d have been much easier without the kids but hey ho, we said we’ll keep them :P

I think what you're seeing is a slight discord between the deep teal and the cool sofa and wallpaper. When people say grey goes with everything, it's a bit misleading as most greys are in fact a colour and it actually is quite difficult to get grey to work. This is because all colours relate to each other and if you have a colour that doesn't 'lean' towards another colour (such as a pure grey) it can look like it's out on a limb. If you find a colour that goes with both the green blue walls and the sofa then that is one way of correcting it. I have the same wall colour in my small lounge and the colour I love with it is 'sandy' colours which is essentially your pouffe and the lovely cupboard next to the fireplace. Wicker, and sandy coloured soft items might help to correct it. Add in some warmer tactile elements around the cooler areas and that will help. This is my TV wall in my small lounge. If I took away the warm ochre elements and the textured hessian shade the temperature would go down. I think it just needs warming up.

Live with it for a while with your own furniture to see what does and doesn't work for you. Personally I would never use the breakfast bar when there is a much more comfortable table to sit at.