Typically that's where Haley sits, who is typically the person you'll first meet when you're visiting or if you're dealing with some logistics with the SF office.

(As an aside, the idea behind the Oval Office as a visitor's reception is to turn the notion on its head a little bit. We've all been to companies where the reception area is just an afterthought, and you're stuck awkwardly standing in the middle of an open floor, not knowing what to do next. Our Oval is a tongue-in-cheek jab at that, and an attempt to make things a little more, well, interesting while you're waiting for a GitHubber to meet you.)