Use a pet cleaner & odor remover with Enzymes & spray it deep into the couch where the urine is, and leave it wet. Cover the wet area with a plastic bag to help keep it wet. It will stop working when if it dries. You may also have to repeat this again the following day. The enzymes work to help the urine to break down & biodegrade quicker. The brands I like best are: "Out!" & "Veterinary Strength Outright". Look for the word "enzyme" on the front. You can buy these products at Wal-Mart, Target, K-mart and at Pet Stores. When the couch is nearly dry but still a little bit damp, take an old toothbrush & lightly brush the pile of the microfiber back & forth so it stands up again. Then brush it again when it dries.
Eeeek! I would use a peat cleaner and odor remover like janice31610 said, also if you are able to take the cover off of the pillow that was urinated on, I would suggest doing so and either washing it in the washing machine or getting it dry cleaned. You want to remove the stain, but you also want to make sure the odor is 100% gone, as it can be very pungent. I would let the pillow sit outside for a couple of hours to let it get some air, good luck!