The living room is assumed to be hmogeneous with respect to its temperature. Thus, there is a single 0-junction with a heat capacity attached representing the air of the living room. SInce the living room interacts with lots of modeling elements, there are many connections to the single 0-junction. Thus, the 0-junction was split into 5 individual 0-junctions connected by bonds.
The living room has four exterior walls facing North, West, South, and East. It has three interior walls connecting it with the other three rooms.
The living room has three exterior windows facing North and South. It has three interior doors connecting it with the other three rooms. There is also an interior window to the solarium. Since interior windows use the same model as interior doors, the student chose to represent that window using the interior door model. There is also an exterior door.
Other than that, there is the roof, the slab, and the air conditioning unit, and that's it.
Of course, the devil is in the detail. Each of these models contains a substantial number of parameters that need to be set, and getting the correct parameter values together for such a complex model is no easy task.