Some suggestions:
- move the staircase 50-100 cms to the left; you get more space for dining & bedroom

- replace stairs with open staircase, maybe a hanging one

Good suggestion, thank you.

This is the result at the first floor (or ground floor):

Night lights



Day lights



The top view of the plan, now the space for dining room is more

- move fireplace to the end of the wall and replace with something more open, maybe like these

Thank you for this suggestion, I will try to apply it and will post the results later.