You should leave the car in gear until the coasting speed threatens to bring engine revs below where it normally idles, then put your foot on the clutch and brake to a complete stop.
Contrary to popular belief you should not downshift when you're slowing down to stop, it ruins your clutch and puts unnecessary wear on the transmission. If you're going down a long hill it won't hurt to drop it down a gear to help slow the car but not every damn stop. The car has brakes for stopping, they do a good job for a long time and they are way cheaper to replace than a clutch. I always laugh when I hear people telling others to row through the gears down to a stop, they always drive automatics and have no clue. Their reasoning is always: "to save the brakes" - Hah! Put a clutch friction disc and pressure plate on a table next to a complete set of pads and rotors, front and rear, for any car and tell me which you think is better suited to slow down a car that weighs almost two tons.