Floor plan of a bungalow with 140 sqm - does the storage space fit?

I’m uploading our plan with furniture.

Which crazy brick format are the wall dimensions following here? - to me, it all looks like "botched jobs in dozens, cheap."

Because the large bathroom can only be accessed from the bedroom, it will later not be possible to swap the rooms.

I think that is a legitimate objection. Personally, I would also make the bathroom accessible from the hallway. This has the advantage that the bedroom is not misused as a passage room, which would have the disadvantage that at least the bed user on the left side of the plan is disturbed in their peace when the other has to walk past them. Especially because the house is very compact, I would design it flexibly. And the hallway is after all the distributor of the rooms. Regarding the freezer room, it should be mentioned that a heating system is usually placed at the shortest path to the outside, i.e., on the exterior wall (that is my understanding). The door should be moved somewhat to the left side of the plan so that a compact wardrobe wall as storage space for coats and stuff is available on the right side of the hallway. I find a guest room rather than a children's room in the position opposite the entrance very sensible. Personally, I would probably leave out the double door to the hallway and separate the sleeping area with one door. The window in the bedroom at the bottom of the plan would bother me a lot.

Is it about the wall structure?

The bedroom window was a request from the builder. Unfortunately, I couldn't prevail. We both still like the bathroom from the bedroom.

I personally would probably omit the to the hallway and separate the sleeping area with a door.

we also have a windbreak door, after almost 4 years it is clear to us that we don't need it. Houses no longer cool down as quickly as with a coal stove heating, Underfloor heating is more consistent. The sleeping area door should not be disturbing when open and should be made of glass

Is it about the wall structure?

If you mean me by that: indirectly yes. I asked because of the fantasy dimensions that made me suspect a special clinker. According to your answer, however, it is a current standard format. Then the bricks do not match the fantasy dimensions (which can be relatively easily concealed in the "wild bond," but still is not the real deal). With the construction masonry shell, it is easier to handle here because of the aerated concrete than with porous bricks or sand-lime bricks, but it unnecessarily costs time when building without providing the slightest benefit. This makes masonry a puzzle (and according to experience, instead it is preferable to work with botched solutions and violate the sensible standard-compliant overlapping measure at the relevant points). It is alarming how many planners nowadays cannot properly divide a meter into eighths anymore. Did the planner here perhaps build upon an amateur design?

We both still like having the bathroom off the bedroom.

And the children always have to go through the bedroom to get to the bathroom. Even when they are older. Teenagers also like to bathe sometimes in the middle of the night. Often with a partner as well.