3’4” x 5’ was the perfect size for my desk. I have hardwood floors and a desk chair on wheels – the two don’t go together at all. If you want to roll for 6 inches, you end up 15 feet away ;-). This rug (or any rug) stops that. I like the looks/colors of it and seems good quality.
https://www.amazon.com/Brumlow-Mills-EW10129-30×46-Earthtones-Abstract/dp/B078T4LX6Y