If you're using a laptop, choose a well-lit, quiet room wherein you can complete the exam and writing section without any outside noise or interruption.
If you're using a desktop and it is located in a public area (such as a living room), it is best to move it temporarily in a private work area where you can focus on the LSAT.
Either way, you should ensure that the location you choose has proper lighting. The virtual proctor should be able to see your face clearly throughout the exam. Once the LSAT begins, you won't be allowed to move out of the webcam's view until you finish the exam.