As mentioned before, you should find a way to put the pieces together to create an overall look. While you can use contrast as a guide, you should find a balance between the two styles. Some ways to unite the two styles of interior design are by using the same color, textures, patterns or shapes. For a formal dining room or even an informal breakfast corner, a modern, sculptural table can be a gorgeous focal point.
Pair it with a set of traditional dining chairs (such as bistro-style chairs) and a dazzling chandelier for an ideal mix of classic and contemporary. Use a surprising element, the largest piece of furniture in the room, or an unusual object as the focal point of the space. By setting the focus, you can easily place other complementary pieces throughout the room to create a perfect combination of decorating styles. If you're just mixing furniture styles, one of the easiest ways to start is to add contemporary art to a classic room, like this brownstone house in Brooklyn by Jessica Helgerson, or vice versa.
The abundant Bowood sofas with skirts, the Bergere chairs, the classic prints on the pillows, the French toilet and the & vintage art mirrors are a classic and traditional style. It's a classic house from the 1920s with traditional architectural elements, but all the furniture and decor are modern. One of the benefits of combining traditional and modern interior design styles is developing a personal style that you won't see in other homes.