Need some thoughts how to arrange the speakers

I have B&W Matrix 803 S2 and a small room (~4*5.5 meters, see the attached picture). I'm in a process of renovation my flat and I have a possibility to make some changes to get better acoustic results. By the left side it's a kitchen, by the right side - three windows. Yellow is a bar table, blue - sofa, red - tv and green - Matrix. I guess the current version is the most optimal for living but not for the music) But the task is to keep everything in the room...

Attached scheme
One thing that may help is to list how your system sounds now, and what you would like to improve.
I agree with Bombaywalla - place the speakers and TV in front of the windows and the sofa several feet in front of the bar table (yellow area). This will give you the best sound quality AND it will eliminate any reflections on the TV screen from the windows.

You will want to put heavy drapes or blinds on the windows to allow for taming of the light coming in thru those windows. And it will also tame any early reflection points off the glass of the windows...

The angled wall with dampened windows looks like it will work. Keep the couch where it is and put your favorite listening chair facing the speaker wall. You just won't be able to have more than one person in the sweet spot.
I can't say that I don't like how it sounds now. But I have nothing to compare with because I'm new to this hobby. Well it sounds much better than my computer speakers)

So after all the replies I decided to place the speakers in front of the windows. Maybe TV will go there also because I don't like an idea to add one more chair. Better to use the sofa.
I'd agree with what everyone else has said. Putting the speakers with the windows behind them would be the best layout. That should give you a fairly symmetrical radiation pattern between left and right speakers. Symmetry is very important to stable soundstaging.

And yes, some thick curtains would be important. As would some absorber panels or diffusers in the first reflection points.