Download the PSD
The first layer is self-explanatory - it's the one I used to clone and heal out the line down the left side. Even though this layer is first in the stack, it's actually the last thing I did.
The second and third layers are this method.
The fourth and fifth layers were to mimic the baseboard from the other side.
The sixth layer is the all-important noise layer which must be used when adding gradients.
The seventh layer is a chunk of carpet from the other photo you gave me, and the eighth layer was to darken that carpet a bit.