Interviews are used in video to drive the story forwards. When planning interviews, you need to make sure that the location of the interview serves the purpose of the video.
At Story Ninety-Four we're always insistent that that background of the interview reflects the subjects surroundings and the tone of the video.
Much in the same way that music, and outfits play a part in conveying the tone of the video, so does the background of the interviews. The answer is rarely a plain wall (but sometimes it is).
For example, if you were interviewing the CEO of a manufacturing business you could choose to interview them in their office, or on the factory floor. You need to decide which background best serves the tone of the story you're trying to tell.
You also need to consider interruptions and noise levels. The factory floor might look great as a background, but if it is too noisy to record clean audio you'd be better off filming in the CEO's office.
At Story Ninety-Four we do site visits to scout the locations and decide on the best background for filming interviews for our clients.