Meaningful residential concept for basement granny flat

Why then open a new thread?

I am not @11ant. I just don’t like searching through all the OP’s posts.

Where are you building?

Who wants to live in the basement? Your child certainly won’t later. Tenants? You wouldn’t put up with that. Because they keep changing, if you even find anyone at all. Not to mention, such an investment never pays off.

Is there a separate entrance for the basement apartment?

How far does the basement protrude from the ground?

Such a thing should only be planned if you're building on a slope.

Show the plot and the entire basement.

Draw the intended furnishing in the floor plan.

You can do it as planned – I wouldn’t change anything there. For renting out, I recommend renting it furnished due to legal capacity reasons. The basement location is not very attractive, but someone who uses the apartment during the workweek and is home on weekends could arrange well with it. It’s good if the company rents the apartment for the tenant. Later providing the apartment to a teenage child is a good and generous idea. I hardly know any teenagers who wouldn’t want that due to the low daylight. One of my two boys even finds it explicitly desirable, since the monitors… Use a generally appealing modern design for the furnishings, such as IKEA, and stick to what the majority wants in terms of equipment (dishwasher, fridge-freezer combo, large sink, induction stove, oven with microwave function, corner sofa, large TVs in living and bedroom, large bed, lots of wardrobe space, fewer shelves, pleasing pictures, functional lighting with small accents, smaller dining table, many coat hooks, shoe cabinet, large floor tiles in entrance and bathroom, laminate in the living areas, large washbasin, step-free shower, no bathtub, own LAN connection with own Wi-Fi router on the communal internet access, separate sub-distribution for electricity, possibly electricity and water meters, roller shutters).

Are you generally an advocate of laminate flooring in rental apartments?

No, for my own living spaces, I prefer real parquet.
We have built 2 apartments with their own front doors and no connection within the house for the children in our house. I laid the laminate flooring there myself with the boys so that they develop respect for their generous living situation. Laminate is inexpensive and durable. Those were the criteria.
The younger son chose tiles in a wood look for his bathroom in his apartment. I don’t like this kind of fake. Tiles have so many material-appropriate appearances of their own that I gladly do without this "fake" for myself. Admittedly: it does look quite nice in my son’s bathroom.
Unfortunately, you have to expect that you may also get tenants who do not handle your property very carefully. Unfortunately, we have already had this experience. In my view, laminate flooring has the least potential to cause annoyance or losses.