So, functionality in design is the definition of all the actions that should take place in this particular room or space. And it's good when the customer is frank with you in the same way as with the attending physician, but this is not always the case. Therefore, if we are designing an apartment, then we must follow the following algorithm:
1. Determination of future tenants (number, gender, age)
2. Identification of habits (for example: a healthy lifestyle may require space for physical education, yoga, etc., storage space for bicycles, skis, snowboards, while the habit of smoking is associated with constant access to the balcony or free passage to the window).
3. A clear understanding of the priorities for shaping the future space (for example: a family with children needs a spacious living room and a large sofa, a separate kitchen area and closed personal space, while a young couple may prefer the most open interior, combined kitchen-dining-living room and sleeping area behind a curtain or partition without doors).
Now briefly about ergonomics. This word is largely synonymous with comfort and determines the ease of use of all functional areas of the room. If you at least somewhere follow the customer's lead and apply a design solution that ignores the laws of space in relation to the human body, then this will be constant discomfort both in the life of the customer himself, and reproaches in your direction with the phrase: "Why didn't you insist ? I am telling you this from my personal experience.
And, of course, beauty. It should be clear not only to your head, but also to be read through the eyes of the observer. It looks like a kind of story, made up of individual words in the form of functional zones, punctuation marks and spelling in relation to ergonomics, which eventually develops into an interesting image and emphasizes the character of the inhabitant of the space.