House placement on a small 448m² plot

Just make them flush with the house.

In the meantime, I have the draft of the floor plan from an architect,

There is no plan for the upper floor yet.

Something doesn’t add up!

The displacement is about 0.5-1m. No more.

But the ground floor is simply much more important to me in this regard, so the upper floor has to take a back seat.

If it’s about one tenth, i.e., 10 cm, then you can speak of "only" – one meter that makes a room upstairs unusable can ruin the entire floor plan!

And accordingly, the bathroom would be narrower or accordingly a little longer

What would you like to give up on? The shower or the toilet?

Please provide constructive criticism

As already said: constructive criticism lacks measurements!!!
Based on fictional furniture drawings, you cannot tell whether the space between the TV and sofa is sufficient or not.
And on the upper floor, it does make a difference whether a room is 4 meters or 5 meters deep, but conversely a possible bathroom in the north hardly offers any space to move.

Just align them flush with the house.

I would push them further back so that the living area gets a window there. Then I would consider whether one might want to look from the living room sofa into the garden... so I would question the windows and furniture arrangement in the living room.

I would push it further back so that the living area gets a window there. Then I would consider whether one might want to look from the living room sofa into the garden... so I would question the windows and furnishing in the living room

What exactly do you mean by pushing it "further back"? So garage south of the house and then towards the west?

Attached is the floor plan with dimensions.

What do you want to do without? The shower or the toilet?

So my parents have a bathroom that is 3.6x2.5m. It’s not big, but it still works well. By that I just meant that there is definitely some room upstairs if you move the stairs down by 1m.