The editor draws the walls
Language models understand requests well but can't be trusted to draw. So the model only returns a description: which rooms, what size, which floor, what each is for. Walls, doors, windows, stairs and furniture come from the editor's engine, so rooms meet without gaps and furniture passes the same walkway and door checks as auto-furnishing.
The area matches what you asked for
The assistant leaves 15 percent for the hallway and corridor the engine adds itself. Ask for 55 m2 and the rooms get about 47, so the plan comes out close to what you requested. If you only give an area, the room mix is taken from a few thousand real plans in the open ResPlan dataset.
The conversation continues
Ask it to furnish a gaming room, a nursery or a home cinema, change floors and wall colour, rename or merge rooms, move a shared wall or add a door between neighbours. If two rooms don't actually share a wall, it says so. Every reply has an "Undo" button that rolls back all of its changes at once.
Show a style with a picture
"Furnish from a picture" takes a photo of a room you like and picks the floor, wall colour and upholstery colour from what the editor offers. In the catalogue, "Find by photo" turns a sofa snapshot into filters for section, shape and colour.