Floor plan & positioning Single-family house approx. 150 sqm 2 full floors Gable roof

Do I understand correctly: The drains from the shower and bathtub cannot be routed straight down through a downpipe because the cloakroom area is underneath? The solution would be a positioning around the corner northeast above the technical room?
Or are the symbols for downpipe the two squares with an X next to the sink? - I would have interpreted those as cabinets.
The square with an O is the laundry chute, which in my opinion is not ideally positioned.

I don't see any downpipes drawn in here yet, nor do I see a problem arising. "My" downpipe would be in the corner of the WC pre-wall. I also consider the cabinets in the bathroom to actually be cabinets.

The square with O is the laundry chute, which in my opinion is not ideally positioned.

Unfortunately, it won't get much bigger... Dryer/washing machine might also go to the upper floor.

Since the freezer room is already very small and the technology will be placed along the exterior walls, a laundry chute is completely off-topic: it will hardly be accessible there – you will probably have to carry laundry up the stairs in favor of a better necessary placement of the technology and without any chute opening in the bathroom.

in the warm season always on the sofa with fresh air through the open terrace door...

In the warm season you should and will not sit on the sofa, but either on the terrace or tending/setting up the garden, etc. You will be glad for short paths to the fridge. This false assumption of "sitting on the sofa and looking outside" usually comes from men who are still living in an apartment with a balcony.

I don't like your bathroom. The dressing room is also rather pointless.

In my opinion, the hallway is dispensable if you integrate the washing machine and dryer into the storage room. It also works well stacked on top of each other. I once moved the bathroom wall by 30 cm. This allows the storage room to also be used as a utility room.

With the window then more like this. The wall can also move a bit to the left. One should plan that a bit more detailed. If you know the views.

Please ignore the previous post.

With the window rather like this. The wall can also move a bit to the right. It should be planned a bit more detailed there. If you know the views.