I moved to a new apartment and under the far left burner is a hole into the oven:
That is my pizza stone you are seeing through the hole.
I understand that the oven needs some ventilation, but this seems like it would cause a lot of heat loss. Indeed the burner and any pan sitting there get quite warm while the oven is in use, I can boil water with the excess heat if a kettle is left there long enough (and the oven is very hot, like when I bake bread).