Clearer:
As it is now: window placement and size in the open living area (living, dining, and kitchen) will hardly brighten this space.
In winter, the sun sets in the southwest and will be blocked by the neighboring house from 2 p.m. onwards, so you will get nothing from this window except a view of a nearby hedge or the neighbor’s house or even a garage. Only through the small kitchen window does sunlight enter.
Even in summer, you would have more dim corners, which are brighter than the entire room in winter, but if you consider that only a terraced house about 6 meters wide has such a patio window, you can probably imagine it better.
If you now place windows in the kitchen and where the couch is planned, whichever they are, you somewhat minimize the problem - a neighbor’s garage would still spoil the view of the nonexistent garden.
Therefore, in my opinion, this design offers very little quality of life if that is based on a bit of sun, warmth, and brightness.
And it is what it is: a plant that prefers partial shade should be placed directly in front of this southwest window so that it even gets some sun. A south-facing plant will die in this room. Probably a person too.
These 3 meters of edge property may be enough for a small breakfast nook outside. The main terrace will be on the garden side: and why has the longest route from fridge/kitchen to terrace been chosen here? Will you sit on the terrace without a drink? Without cake or salad for the barbecue?
Therefore: open the house to the southwest, create space, light, and openness -> different house placement, so that possibilities on the main sunny side arise at all and can be used.
Upper floor: the bedroom as a walk-through room is not at all thought through, all the windows are insufficient.... mathematically they may be smaller than standard DIN size. 1/8 of the room area should be window size. That means: for 16 sqm, the minimum requirement is 2 sqm. I only see that in the bathroom, where you actually cannot use a floor-to-ceiling window at all.
Overall, I find the house placement and many elements not thought through at all and not even meeting minimum standards. And probably all this because the main focus is on the garage and a house builder was chosen who has not changed his floor plans in 30 years, so the architect has become a little sleepyhead.
My suggestion for improvement: #8