I think this is the best way to describe the places where most vivas happen. They might just be another seminar room in your department, but some universities have their own viva suites. You probably can’t control where it will be, but you will know in advance, and that can be really useful.
Any space you’re working in can have an impact on the quality of the work you do. The room your viva is in can have an impact on how you feel. But because you know the location in advance you can do something to help yourself.
Check the layout. Does it make a difference to you if you can see a clock in the room? If there is one, do you want to sit with your back to it? Check it there is a whiteboard, chalkboard or flipchart. Would you need one of these? Is there a window in the door? Would you sit with your back to that, so you don’t get distracted by passers-by?
Environments do have an effect on our confidence and performance. Explore your viva room ahead of time and see what you can do to make it the best space for you.