The rustic attic of the photo above shows textured wood and exposed rafters. If you have a rustic space like this, you may want to focus on the type of furniture you are installing. A good addition is the wooden furniture. The wooden texture of the office harmonizes with the attic, but the furniture always gives a slightly modern impression with its thick geometry.
If you are creating an office in the attic, it is a good idea to find a wooden desk like this, matching the rafters, which gives an impression of cohesion to the space. As this is an attic, it can be tempting to throw away the used furniture that you have up there, but you run the risk of appearing randomly and randomly.