Steps between kitchen/dining room and living room

I really like the idea, but I’m not exactly sure where on the ground floor... maybe right by the kitchen? Or at the back by the terrace...

I think the idea with the bench (preferably a wide upholstered bench) on the upper floor at the "divider" is better. A window seat isn’t really comfortable. Probably too warm on the south side. I also don’t know if I would change the terrace door to the south. You can, but you don’t have to. A window seat, if there is one, is nice for passing time and a bit of fun sliding. If you have poles as a divider, the kids can have fun with those too. And honestly: why should the children stay in the dining area when they can romp around or watch TV upstairs for a few more minutes?

I think the idea of the bench (preferably a wide cushioned bench) on the upper floor at the "divider" is better. A window seat isn't really comfortable. Probably too warm on the south side. I also don't know if I would change the terrace door to the south. You can, but you don't have to. A window seat, if it exists, is nice for passing time and some fun sliding. If you have poles for the divider, the kids can also have fun with them. And honestly: why should the children stay in the dining area when they can still romp around or watch TV upstairs for a few minutes? So something like that. Quick & dirty again:

Sorry, I still don't understand: why does the window in the living room at the top left of the plan have to be bricked up?

Unfortunately, the window cannot remain due to the extension, which goes exactly through this window. You can see it in yellow (everything yellow is part of the existing building and will be removed):