I had the same problem. I found some extra material on my car between the fold down arm rest in the rear seat area.
I cut the burn up, used cloth glue (avaliable any where)make sure it dries clear.
On the cloth piece I grabed from the arm rest, I cut a piece smaller than the hole and glued it in.
Then I cut the woven backing off of another piece and began shredding the fibers to lay around
the outside to blend the patch in.
It's not perfect but I don't have a hole. I looks worse than it does in person, but the patch
has also been there for over 4 years.
Take your time doing this and it should look ok. Cheaper then re-covering the seats.