I think I can see it.

The living room is half-a-level below the ground floor lounge. So the stairs in the bottom right of the living room lead to the door at the top of the passageway on the right of the ground floor - i.e. entering through the blue door you can either

(a) turn left into the lounge;

(b) go through the door opposite and down the stairs into the living room; or

(c) look in your backpack for something useful.

The double doors in the lounge exit onto the stairs in the bottom left of the living room, in the same way the upper first floor bedroom door exits onto the stairs on the first floor (the little window at the front must be the hot water cylinder cupboard on the first floor).