This solution is the result of a study of spaces, materials and colors that would fit the rooms of the flat, trying to meet your demands and tastes.
The main goal is to confer an elegant and strong personality to all the spaces - starting from the living/dining room, where the white walls contrast with gray, blue and wood-brown tones of the furniture. Regarding the design of this space, you can choose between two proposals.
The main one, where the living area is big and comfortable, the three seater sofa is placed in the middle, facing the north wall together with the armchair (if you prefer a blue sofa, a gray armchair would work too). The south area of the room is the space dedicated to music. The Ligne Roset dining table faces the entrance door, working as a link between the kitchen and the living room.
The second proposal aims to keep the actual dining area next to the kitchen, for the family, and to add the new table closer to the window's light, in order to have a bigger place where to eat when you have guests, and at the same time have a lightful desk, as an open office. The living area becomes more intimate.
The tv stand and the bookshelf have been reatained.
The hall area is very simple and minimalistic, space-saving furniture has been chosen to keep the light coming from the glass-wall facing the entrance door.
The double room's design promotes the desire to place the bed close to the daylight. If the radiator makes this choice complicated, bed and wardrobe's positions can be inverted.
The girl's room is big enough to place a double bed in it, but of course a single one would take less space.
The boy's bed has to be placed in the corner of his room, in order to get enough space for a wardrobe and a desk.
Thank you very much.