Once the more open plan brought in a modern feel, Donadel needed to add in the warmth. "We cozied up the space with a careful balance of materials," says Donadel. "Using very clean sharp lines keeps things from looking cluttered." Case in point: To keep it as clean lined as possible, the glass railing you see upstairs has a support system hidden within the floor. Here, a sharp line between a limestone wall and more Plyboo wood differentiates the two floors. The wood continues up the wall and across the ceiling. "The element of wrapping is an important one we carried throughout the house, to give things continuity," explains Donadel.