What size is suitable for a kitchen island or passage widths?

Our island is 3.10m x 1.17m.
3.10m because otherwise, according to the kitchen studio, it would have been difficult with the Dekton slab in one piece.
1.17m so that normal base cabinets (or drawers in our case) fit on both sides. I think it’s perfect this way. In my previous kitchen, the island wasn’t that deep, so I had to maneuver carefully with the dishes.
The distance to the cabinet wall is about 1.2m, so the dishwasher and drawer opposite can open fully without problems, with a bit of space in between. I would do it that way again, although it doesn’t happen often that exactly opposite drawers are opened at the same time, but sometimes it does.
My husband and children are not very careful and don’t pay attention; I had to learn this the hard way with scratches from the previous kitchen.

I am of the opinion that the current dining area is too small and we should create a seating corner or something there. We could then realize a sofa arrangement with a TV in the gallery above. However, my wife sees it differently. She thinks it will work with a narrow but longer table or a corner bench.
The kitchen unit contains the sink and the rest. Except for the hob, which is planned in the island.
Attached is a sketch of the kitchen. However, we probably won't install pendant lights for now but recessed spots there as well, as they are cheaper. Unfortunately, everything is a bit more expensive than expected.

If the kitchen wall is not a continuous cabinet wall, I would definitely make the island deep enough so that normally sized base cabinets fit on both sides to store everything.

What are the dimensions of the area now marked as dining?

Friends of ours have a table extending from the island, island with a Dekton countertop, table made of wood.
But even there, it depends on the space.

I would place the cooktop more to the side rather than in the middle to gain more workspace. You have enough tall cabinets: don’t you want to install the dishwasher elevated? I find it very practical.

What is not visible in the photo: if you have many deep drawers, then carefully consider what you want to put in them. In tall drawers, items often have to be stacked (except for trash, bottles, and kitchen machines). That is annoying. Inner drawers are possible but constantly require an extra step to pull out the drawer. That annoys (me) too.

How big will the stove be? With the extractor hood probably 80-110cm? I would also move it slightly as Bertram suggested, into the base cabinet grid 2+3 from the left in the front view. With both cabinets, you would probably lose the top drawer, depending on how big the base is?

Representing the whole thing in 3D with moving boxes is much more valuable than shifting 10cm back and forth on plans. Drawing on the floor or walls is already good, but most of the time you don’t have enough spatial imagination for it to really be accurate in the end.

A bit off-topic: How is the building envelope constructed? Are those aerated concrete blocks towards the neighbors? I find the structure interesting, it looks like a reinforced concrete skeleton with infill to me. To the architects, does this occur more frequently in residential construction?

On the inside, the kitchen planner has planned 3x1m wide drawers for us. The drawer under the cooktop will be omitted. Instead of the drawer, sockets are to be installed there. I also considered moving it. But it can only be divided into thirds. So either left/middle/right third. It is a Bora Pure cooktop with a round extractor in the middle (76x56.5cm). The dining area is only about 2.7m wide at the top left of the plan next to the stairs up to the outer wall. It might actually be a bit wider because the lift-slide door comes in after 60cm, and it is slightly offset outward. We were assigned quite a few reinforced concrete supports by the structural engineer. Which also made everything a bit more expensive. I was also a bit annoyed with the structural engineer because it required so much steel and the construction workers already told me that it is quite a lot of supports/concrete/steel. In between, regular filled 36.5cm bricks were then built.