Your living room is usually the place where you and your family spend most time when you are at home. It's where you relax and watch TV and where you talk about the day you have had. You want it to be a room which is spacious and comfortable, and where you do not all feel crammed in and claustrophobic.
For this reason, adding the feeling of space to a living room is always a good idea. You may not realise it, but adding a simple window mirror to the room can help you to do this.