Done in Adobe Illustrator.
The oval in the roof is the oculus, and the little rectangle in it is the impluvium, the decorative pool that collects water.
The roof to the front of the house is blue. The back of the house is open, no roof, because it's a garden, as you can see with the trees I have in the green area.
The red in the front of the slanted roof made with shingles. This is the same for the sides of the back. Under those parts of the roof are indeed bedrooms and other rooms to the house that should not be exposed like the garden.