ᐅ Single-family home floor plan, 1.5 stories, 2 children's bedrooms, 2 offices – is the space usage optimal?

Hello everyone,

Development Plan / Restrictions
Plot size: 650 sqm (7000 sq ft)
Slope: East-West: 1.20 m (4 ft); North-South: 1.5 m (5 ft)
Floor area ratio: 0.4
Building envelope, building line and boundary, up to 3.5 m (11.5 ft) from the street
Edge development: East: double garage (approx. 5 m (16.5 ft) from the street)
Number of parking spaces: 2
Number of floors: 1.5, knee wall height: 2.20 m (7.2 ft)
Roof type: gable roof, 30°
Orientation: ridge line: north-south
Maximum heights / limits
Eaves height: 5.80 m (19 ft)

Client Requirements
Basement: yes
Number of people, age: 4 middle-aged adults, 2 children
Office: family use or home office?: 1 home office, 1 multipurpose / hobby / reading room
Open kitchen, kitchen island: open L-shaped kitchen, i.e. no direct view to the living room
Garage, carport: double garage (east boundary)

House Design
Planner: designer from a construction company
What do you particularly like? Why? Room layout, extra office on the upper floor, kitchen recess, option for west-facing terrace
What do you dislike? Why? North-facing office window (due to symmetry), limited space in the living room, space/recess for cloakroom, staircase not in living area, children’s rooms and living areas with south-facing windows
Estimated cost according to architect / planner: ~450,000 € incl. basement, excluding garage and exterior landscaping
Preferred heating technology: air-water heat pump with underfloor heating