City villa approx. 150 sqm on 500 sqm plot

but you do have your room thermostat for that, right?

Yes, it probably can do that too (if you have one). But as far as I perceive threads on this topic, I don't read a homogeneous opinion here regarding single room control.

We have also installed a floor sensor that prevents the floor from cooling down completely when the stove is heated for a longer period.

I'm a bit stumped here: the floor sensor reports that it is warm near the stove – not that anything there would cool down; so to prevent the consequence of a reduction in heating activity, it needs less the floor sensor itself than a "program" to ignore it in this case (?)

I'm stuck here: the floor sensor reports that it is warm near the stove – not that something would cool down there; so to prevent the consequence of a reduction in heating activity, it's less about the floor sensor itself and more about a "program" to ignore it in this case (?)

No, in this case the floor sensor compares the room temperature of the ERR with the temperature of the floor so that, for example, if we heat the stove a lot on a weekend in winter and it is relatively warm in the room, the floor does not cool down because the ERR does not activate the underfloor heating.

so... these are the original floor plans. This is how the house can be built.

Oh dear... do you want/have to make gold out of sh** now? That won’t work. My opinion: the hallway, the staircase ruin the hallway and thus the entire design. Someone wanted to be especially creative?!

Take another basic design, staircase on the outside wall or a quarter-turn staircase on the stairs... all better starting points, where a fireplace also fits. You don’t have to worry about the technology yet. A fireplace is great, although the house will get very warm, I don’t know of any (unsolvable) problems that would arise from that.

North - Garage East - Street South - Guest bathroom West - Garden / Living, dining, kitchen

Is the arrangement intentional? Utility rooms facing the sun and living rooms in the dark? First of all, I would mirror the entire room arrangement on both floors, especially to get the children's rooms on the sunny side.

As for the stairs and hallway, I can hardly imagine this coming from a professional planner. A block standing in the way that you have to squeeze around.

The garage has already been mentioned, boundary-near development 8 meters plus an additional carport in front (? that's how I understand the drawing?) will not be permitted.

Consider in the upper floor maybe whether you don’t want to attach the dressing room to Child1 and then enter the bedroom through the dressing room. For us, it was important on the one hand that no bedroom borders another, which would be the case for all 3 rooms with you (but that could at least be solved by the dressing room), and on the other hand, in my opinion, the dressing room should not be entered from the bedroom but the bedroom from the dressing room. What time do you get up tomorrow? At the same time? If not, one of you will be running out and in for half an hour while the other is still sleeping. Either that, or I would make the dressing room directly accessible from the hallway but never through the bedroom for the reasons mentioned above.