I stayed at Le Cartier during a particularly stressful week in the middle of November. I couldn't have chosen better. It was quiet, warm, and 2 steps from Papineau metro stop. The room was huge, clean, with its own bathroom. I never heard any noise from the street or from other guests. It was an ideal place to stay. The only caveat: don't bring a car. You don't need it in Montreal and parking is a migraine.
