My floor plan for a 4-family house, please share your opinions

Cross out an s in [Dass]

I see: a basement is not even planned yet.
Then the apartments will wear out faster and the tenant turnover will be very high.
Anyone who lives here will put their second refrigerator on the terrace, use the garden as a bulky waste storage, and will have to fill the apartment very full.
What is the target group? With what features should the apartments score to be attractive? From the outside it looks quite attractive, but it seems like a gimmick, right? At least for the ground floor residents.

Cross out an s in "Dass"

I see: a basement is not even planned yet.
Then the apartments will wear out faster and the tenant turnover will be very high.
Anyone who lives here will put their second fridge on the terrace, use the garden as a bulky waste storage area, and have to fill the apartment very full.
What is the target group? With what features should the apartments score to be attractive? From the outside, it looks quite attractive, but it seems a bit like a sham, right? At least for the ground floor residents.

Thanks for your opinion!

Yes, there is no basement.

It is indeed a bit tight on the ground floor, but it is supposed to represent a small to normally sized apartment. A storage room would be nice, if not inside the apartment, maybe outside.
Do you perhaps have an idea where something like that in the apartment could be placed?

In the apartment above, there is a storage room on the balcony, which could be larger, or if the heating room in the attic is removed, it could be realized there...

Two large garages are planned and two garden sheds for apartments without a garage (parking space), where bicycles, tires, etc. could be stored.

The target group is not exactly defined, but for the apartment above, families with children, and below we will see what shows up, in any case not people who need a second fridge on the terrace.

The apartments will be fully equipped with underfloor heating, high-quality tiles and bathrooms, network, satellite antenna, electric shutters, large windows, terraces or balconies, each with their own gardens, etc. All this is located in a very well situated and popular residential area, close to the train station, bus stops, and highways.

This architect has certainly never built for a landlord who thinks in real estate economic terms. The concept suffers massively from the vague orientation towards the target group "Someone will find themselves." They won't - at least not if you want "attractive" tenants.

The apartment layouts are a mess in two respects:

Secondly, in the layout. A living room of over 30 sqm does not match the same league of tenants as having a kitchen corner in the apartment, or a bedroom with integrated closet space of 14 sqm.

And first, in the differentiation. Tenants in the income group "130 sqm" cannot simply be offered a 90 sqm apartment like the ones below with a "private realm" for child 2.

That a development plan would not allow expecting more than a pulse-calming work from an architect, I have never heard of.

If renting out a semi-detached house half would not be profitable, that would only be one more reason for me to aim for an asymmetrical division:

Namely a division of about 60/40 to 55/45 in the floor area; with the "narrower" part as a "maisonette plus" in the form of a classic semi-detached house and the wider part with a nice apartment on the upper floor, a single apartment and the utility room on the ground floor as well as an apartment in the attic, for example.

You can't design an investment property with wishy-washy "let's see" concepts :-(

The target group is not exactly defined, but for the apartment upstairs families with children and downstairs we will see what emerges, in any case no people who need a second fridge on the terrace

Families with children prefer to have a garden in front of the terrace, while well-earning couples often prefer not to have one (because who would take care of it during the 4 weeks in Australia), but rather a nice large balcony.

Alternatively to the suggestion from 11ant, you could also consider 2 maisonettes per half. One large apartment (4 rooms) on the ground floor + half upper floor (e.g. the 2 children's rooms on the upper floor) and a spacious 2-room apartment on the upper floor + attic with a nice roof terrace (possibly sleeping and bathroom on the upper floor and spacious all-purpose room in the attic).

Such a construction would also, when combined into a large apartment, not have a second, difficult-to-use living room on the upper floor, but then a large room with kitchen in the attic. This can then be used as an "apartment" for guests or for the teenager. One disadvantage, of course, is the additional staircase from the ground floor to the upper floor; here a spiral staircase could be an option, which can be developed for use as a single house.

In the apartment upstairs, there is a storage room on the balcony, which could be larger or could be realized there if the heating room in the attic is eliminated.

Two large garages are planned and two garden sheds for apartments without a garage (parking space), where bicycles, tires, etc. could be stored.

It's not about whether there is a storage room for garden furniture or lawnmower/tires. That is realized on both levels here. It is primarily about storing ironing boards, vacuum cleaners, and similar items INSIDE THE HOUSE. This is not realized at all on the ground floor, and the attic would rather have to be used for that on the upper floor.
This makes the apartments lose their status as fully functional apartments for me.

The target group is not exactly defined, but for the apartment upstairs families with children, and downstairs we’ll see what shows up; in any case, no people who need a second refrigerator on the terrace

That’s contradictory though. The yuppie, single, or couple who would rather have only a balcony has oversized space upstairs.
The family with garden access has no space to spread out.
The single downstairs would in turn be annoyed by a household with children above... that’s not well thought out, in my opinion.

How should it be done better?
Greed eats brains. Instead of building 4 thoughtless apartments, where tenants will presumably stay only one or two years before getting something bigger (screw high-quality fittings, which would also drive the rent up a bit), or where they can better fulfill themselves, I would also advocate a different room layout, rather only three units.
Downstairs space for 4 people who want a garden, upstairs neat apartments that come with a maisonette flair.

I agree! We currently live with a child under the roof. There is a small garden, but we use it little because the effort with a toddler for just a few minutes outside is somehow too much when you always have to go down yourself instead of simply having the terrace door open and the child can go out and come in as they please. In my opinion, a storage room is also absolutely necessary for vacuum cleaner, drying rack, ironing board, etc. For example, we still have the stroller there, which we no longer need, additional shoe cabinets, etc.