You can pickup public transport ticket directly at the airport. Since it will be early summer, it is also possible to buy Bixi passes (Bike sharing system) directly at the stations.
Montreal has lots of great hotels and hostels. The official hotel is ZERO1. See the section, below for the promotion.
999 St-Urbain Street
Old Montreal, Quebec, H2Z 0B4
Metro: Place d'Armes (Orange line #2)