In the basement, only one room has a window? Where is north in the plan? Does the garage have the same wall thickness and insulation as the rest of the ground floor?
If I were to plan so generously, I would make the entrance area more spacious. The entire upper floor is planned extremely generously, but on the ground floor the guest toilet is minimal in size and the entrance will feel like the hallway of a social housing unit, and the staircase has the charm of a stairwell. If a spacious appearance is desired, I would consider combining the staircase and the entrance area into a spacious entrance hall, possibly with a small gallery. The 7 square meter pantry is also extremely large, but loses part of its usefulness due to the passageway.
Are there reasons for the dimensions, the location of the garage and the bay window? A large part of the inefficiency comes from the location of the entrances and the narrow floor plan. Stupid question: Has an architect ever looked at the floor plan?