Tile size - Please send photos/images, I need help making a decision!

Have you acted on my recommendation from ? Then show the result. Next question, what does your tiler recommend?

Isn't this format ideal for that or am I wrong?

In a corridor two units wide, only one unit on each side of the joint would be possible, so the only joint would be very conspicuous, also serving as a center line. That would bother me. In view of our quite different tastes, it should be just right for you :-)

Which tile format would you choose for my hallway?
It drives me crazy that I don't know how to counteract the narrow hallway.

For a hallway two units wide, only one unit on each side of the joint would be possible, so the single joint would be very noticeable and also immediately form a center line. That is exactly what would bother me.

In terms of our quite different tastes, it should be just right for you :)

oches

Here is my floor plan.

I am grateful for tips (direction of the flooring)

A few data points for orientation.
The house is 23.3 m wide.

Open hallway to the living room completely without a door.

Living room dimensions approx. 8x7 meters
Entrance 3x3 meters for proportionality.

... sorry, you're posting such a fragmented piece here and expecting us to outline the installation options for you? You can only do that either with a good tiler who simply has an eye for something like this and starts laying out some tiles so you can see the effect. Or, as I described above, and there you can expect that you at least make a start. And, if you expect our help, you attach a properly dimensioned floor plan as accurately to scale as possible, once as an image and once as a PDF.

Because something like that has to be done precisely, and you have to think about the joints as well.

And then you also sketch how far this tiled floor should go, since you want to lay parquet. What kind of parquet? A picture would also be nice, etc.

Furthermore, there are really plenty of pictures on Google where you can simply post a few things that you (YOURSELF) really like as examples.

It drives me crazy that I don't know how to counteract the narrow hallway.

You can't really do much to counteract that, tiles can't turn a narrow hallway into a huge entrance area.
There are tons of pictures on the internet with examples of how square or rectangular tiles look in narrow hallways. Then it also depends on whether your tiles are light or dark, what color the grout is, and also what you personally like.