Often when one cat begins to urinate or spray outside of the box, others will also begin to have litterbox problems. If so, try putting the boxes back in their original places. Environmental stress may also cause vulnerable kitties to develop litterbox problems. Things that you or I think are insignificant can be interpreted as a major crisis by your furry feline. If Fluffy continues to mark in the same spot, consider feeding him in that area.
Cats usually avoid defecating or urinating in areas where they eat.
While food dishes might not look attractive on the sofa, neither do urine stains. Make it a play area. Place Fluffy's favorite toys in areas where he has previously soiled. Get an interactive toy such as the Feline Flyer or Whirly Bird and have play sessions. The exercise will also work to burn up excess energy and relieve stress.