I am renting out 1 room in my 2 bedroom apartment. The apartment is located just 7 min. drive from downtown Montreal in a beautiful area, on a shore of Saint-Laurent river, called Nun's Island (Ile des Soeurs- in French). It is considered the greenest area of Montreal-island with lots of parks, tennis courts and bike-paths. The apartment is on a second floor of a 3-story building. There is a big living-room with a dining area, kitchen, bathroom and a balcony. Plenty of guest parking spaces available near the building. Regarding the transportation, there are two buses going to down-town/old Montreal. They are running the entire day, so no absolute need in a car- just follow the bus' schedule.
Little breakfast (or may be not so little :) included in the price. High speed internet and wifi available.