Floor plan for age-appropriate living (new construction) in an old courtyard complex

I want to replace two sheds with two houses in an existing courtyard complex (four-sided farmyard, brick). Each house should have one apartment on the ground floor and one on the upper floor. Access is from above via an external staircase / gallery, with the possibility to retrofit an external elevator. The outer building boundary is defined by the existing courtyard complex, which should not be expanded. Here I am first putting the floor plan for the first apartment (GF House 1) up for discussion, which I want to move into myself. I am looking forward to your comments.

Development plan/Restrictions
Slope: no
Building window, building line and boundary: within the existing courtyard
Edge development: no
Maximum heights/limits: surrounding buildings

Client requirements
Style, roof shape, building type: adapted to existing courtyard complex; gable roof; two-family house
Cellar, stories: no cellar, GF, UF
Number of people, age: 2, over 60
Space requirements: sleeping, living, dining, cooking, + 2 rooms for office/guests
Office: family use
Guests per year: multiple, also simultaneously
closed architecture
conservative construction
open kitchen: yes
Number of dining seats: 6
Fireplace: optional
Garage, carport: no
Other wishes: very bright living rooms; senior-friendly

House design
Who designed it: architect
What do you particularly like? Why? High rooms with tall windows (-> lots of light); symmetry of the exterior (appearance)
What do you not like? Why?: Uncertainty regarding usable areas. Note: unlimited additional usable space is available in the courtyard
Price estimate according to architect/planner: 650,000
Preferred heating technology: underfloor heating, heat pump; wood depending on mood and pleasure

Why did the design turn out as it is now? Family planning, consultation with friends, consultation with construction manager, implementation by the architect (two cycles)
What makes it particularly good or bad in your eyes? Fits into the existing surrounding buildings; two additional rooms; very bright

What is the most important/basic question about the floor plan summarized in 130 characters? Where can the floor plan still be optimized?

What do you understand by age-appropriate or up to which handicap do you want to live in the apartment

What do you understand by age-appropriate or up to which handicap do you want to live in the apartment

I wondered about that too. It can only mean "everything on one level," otherwise not "spacious" and doors, as much as the carpenter can deliver. ;)

I also wondered about that. It can only mean "everything on one level", otherwise not "generous" and doors, as much as the carpenter can provide. ;)

It wasn't just about that for me. There is a difference whether one level or planned all the way to the end with hospital bed, walker, etc.

It wasn’t just about that. There is a difference whether one floor or all the way through with hospital bed, walker, etc. is planned

Of course. I wrote that indirectly.

I always find outdoor stairs very problematic in our latitudes. In winter, you can easily slip down and break your neck. That would already be a deal-breaker for me and therefore a restart is absolutely necessary.