S.B.
When my son was potty training I put a waterproof pad on a couch cushion. It was a pad meant for a crib mattress, so it was the perfect size. He just learned for a while...that was "his spot". It kept the couch clean, washed easily in the washer and I could remove it when we had company coming over. We also got into the habit of reminding him to potty before getting on the couch.