The exterior is an inwardly sloping dome, with slate silver fish scale tiles. There is also several white lines running vertically down amongst the tiles. On the edges is metal gutters around the base of the dome. On either side is a semicircular window, with a short white overhang, a white grill, and green metal gates for decoration.
The interior has cream pink wallpaper, with no distinct designs. The floors are made up of series of overlapping dark oak rectangles. In the center of the room is a circular pink rug, with a black and pink flower design along the edges. The room is entered through a wooden trapdoor, which has a dark oak border around a birch center. Upon entering her room, there is a chaise lounge is to the right. Its upholstery has pink with white polka dots, a white wooden frame, and white triangular legs. Its back is curved and burgundy with a white border on the outside, while inside, it has wide pale pink and lighter pink stripes, and thinner burgundy stripes. On either arm of the chair is a burgundy armrest. Resting near the back is a burgundy throw pillow with thick pink edges. A cherry red paper umbrella rests against the chair. Marinette's bed is in a loft above her desk and has pink sheets with two thin black lines running down the middle. The top is black with two think pink lines through it. Above it is a pink billow adorned with a bow decal and a large pink and brown cat pillow. The fitted sheet is a dark magenta. Above her bed is a small shelf with books and a cube-shaped nightlight. The loft is accessed though a set of white stairs with black railings beside Marinette's desk. A dressform is near the base of the stairs along with a full-sized mirror. The skylight door to her balcony is above her bed.