Directions from Marriott to Mission Church
From Marriott Hotel, turn RIGHT on Huntington Av. Turn RIGHT on Dartmouth St. to Back Bay Station T. Take Orange Line subway OUTBOUND (in the direction of Forest Hills) 3 stops to Roxbury Crossing. Exit T station and turn LEFT on Tremont St. to Mission Church (a.k.a. Our Lady of Perpetual Help).
N.B. This walk on Tremont St. 5 blocks slightly uphill. There is a bus, #66 to Harvard, across the street from the Roxbury Crossing T station that will take you to Mission Church. You will need to allow 20 minutes extra travel time to use this bus (it does not run frequently), and it will be very crowded at this hour.