Our floor plan design for an affordable house

I would like to claim that our step width is also less than 24cm...

Well, not everyone can build 200m². The land is bought, and more is simply not possible now. So you have to make the best of it. Sheds in the garden can really ease the situation and are quickly built. Otherwise, you just have to pull yourself together.

The house shape might be original, but there is a reason why something like that is not a standard. The rooms partly have unfavorable depths, are badly designed, and uncomfortable. That happens when you only optimize one level and then squeeze the rest into the corset.

A ceiling height of 2.84m is, in my opinion, complete nonsense for this house size. You should forget about something like that. Or do you want to make a church out of it? If you build cheaply, small, and with 2 children, there is no space for a 5m staircase with gallery or open space. Every centimeter counts here. And falling down the stairs with 2 children is even more dumb.

Attached is a design with a ceiling height of 2.70m and the same floor area:

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How good are you with building roofs now? If you really do it yourselves, you could plan a small extension for the technology room on the ground floor to gain more space. Then the roof as a carport extension as an attached shed roof. That should be a piece of cake for you.

Our staircase also has 19x23.5 for space reasons, it’s not dramatic.

I would dare to say that our step width is also less than 24cm...

In the case of planning errors that have already been built and cannot be changed, we remain discreet.

Better not to experiment with the stairs. That would be saving in the wrong place.

but the office with PC does not have to be lockable.

As long as you don't communicate much, that's fine. Disturbance can also come from the person who is working. A small open desk fits almost anywhere.
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But do you think it bothers downstairs while watching TV if a sewing machine is rattling upstairs in the hallway?

Yes.

But if the participants write here that there is a lack of storage space, then that's how it is.

The storage space in your design is very limited and has quite radical consequences for how you handle consumption. You really have to want and implement that. With small children in the house, that is not easy.

But maybe as a teenager you want to quietly play something on the PC downstairs while you watch TV on the sofa

The practice I know is that teenagers play in their own rooms.

I think an open concept is conditionally good.

An open concept, just like a closed concept, has to fit the lives of the residents. Since the children have their own rooms, I am not worried about their retreat options. But expect that the children will have visitors and, as they grow older, also at increasingly late hours.

It needs doors that can be closed. As far as I know, if the parents are in the living room or dining room, that's okay, and the youngsters mingle. I'll measure our stairs. One more step would be good. It was forgotten to be changed after the structural engineer raised the ceiling by 10 cm.

The practice I know is that the teens play games in their own rooms.

It should only be an example, not to generalize from oneself to others. However, I do know a few cases among acquaintances where, out of thriftiness, not both children have a laptop/PC in their rooms (everyone has a mobile phone and TV though), but rather a shared "gaming" PC in a neutral place (for reasons of fairness / usually in the office or guest room) is used and gaming is done alternately. Just an example as I said, meant to encourage switching perspective.