Please provide opinions on the old building floor plan

As a fellow sufferer regarding the floor plan, here are my two cents on the questions raised.

We found ourselves in a similar situation with a small windbreak with a guest WC and a large hallway with a glass front. The hallway gave us quite a headache. We decided to keep it as it is and just close off as many doors as possible and create as large a connection to the rest of the living area as possible, with seating on the sides that invite you to linger and create a cozy atmosphere. Then the hallway can wonderfully serve as an intermediate space between the terrace and the living room in summer, or also as a fully functional second living room (which I especially imagine as practical with older children).

We only kept the small windbreak with an approximately 1.5m wide built-in wardrobe as a cloakroom + shoe bench and did not expand it. Definitely a mistake with small children (strollers, balance bikes, etc. also need to go somewhere in winter). A closed wardrobe in the hallway makes sense with your layout, I would not put up a wall. It simply creates a nice "coming home" feeling when you go directly from the windbreak into a cozy transitional room with a panoramic view of the garden.
The guest WC can be discussed. We kept it there and it is regularly used. As a remedy for the small windbreak, the porch will be fitted with glass walls next summer, creating a cold anteroom for dirty shoes and strollers - just as a suggestion.

Regarding the rest: Anyone who has such a garden and conservatory with large glass fronts on the ground floor will not be sitting on the balcony in front of the bathroom (unless there is a sauna in there). I would seriously consider closing the front with glass panes or inquire about the costs.
In the living room, if the window is to be replaced, definitely extend it to floor level. It hardly costs anything and an exit from all rooms into the garden is simply wonderful.

For most things, excerpts below are definitely practical. I just can't really imagine that for glasses... They fall over every time you open and close, don't they?

Personally, I also find glasses and cups better in an upper cabinet. I just wanted to encourage you :) What kind of windows are those? Maybe consider placing a wall cabinet on the sides of the window side or simply installing a shelf in front of the windows/a window at the appropriate height. Also remember to leave a wall stub between the dining room and kitchen for the refrigerator and oven.

Regarding the wardrobe: the corner by the children's bathroom would be suitable for a cabinet. Then place another cabinet to the right of the children's hallway, and use the wardrobe in the staircase for coat hooks. Or you could also reduce the size of the bathroom: tub in front of the window or tub instead of the shower and only one sink. Connect the gained space from the tub with the 1.60 in the hallway and place a long built-in cabinet/wardrobe there.

Oh yes, I'll attach an exterior view from the garden. We haven't taken any more photos ourselves. We're still not sure if we want to keep the conservatory.

I would keep it - everything looks very well maintained, and I would not structurally alter the apparently well-planned and well-executed extensions and conversions. I don't know when the Energy Saving Ordinance demands what kind of insulation effort. If one is allowed to weigh this by reasonable discretion, I would see 24 cm pumice less critically than 24 cm solid brick. I estimate the building from the sixties, so the latter would not be unlikely. The conversion concept seems coherent to me, but I would still change it: moving the bedroom wall, yes, but in the other direction (more dressing room space), breaking through the family bathroom into the children's room, children to the attic.

Am I just being too stupid or is there no way to find my own threads somewhere here? I wanted to give an update because today we were at the house with a structural engineer. It became clear once again that real estate agents promise the moon. The wall between the planned children's rooms is load-bearing, so adjusting the sizes won't work. We need to consider if that's okay for us, with one room being almost twice as big as the other. Possibly one as a bedroom and one as a playroom, and only separate them at about age 10. That's how I grew up and it was never a problem. The wall between the kitchen and dining area is also load-bearing. When removing it, about 40 cm of wall must remain on both sides and a steel beam will be installed. The remaining stubs restrict the kitchen planning a bit, but it will work out. After initial reluctance, we actually like the idea of removing the guest WC and using it as a wardrobe ;) Upstairs, we can realize the master bath as desired, and it is actually possible to use the fireplace as an installation shaft. Overall, everything looks good. Now we are waiting for the cost estimate for the (as the bank called it) luxury renovation and whether it fits into our planned budget. Best regards :)

Am I just being too stupid or is there no way to find my own threads anywhere here?

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The wall stubs somewhat limit the kitchen planning, but it will work out.

You can also just use steel beams as supports instead of the "wall stub." Usually, these can even be integrated into the side wall so that they don't protrude anymore, allowing you to use the full width of the room.

And why can't the wall between the children's rooms be removed? "Load-bearing" just means that the ceiling has to be supported elsewhere - it's the same situation as in the kitchen.