From the Airport:

By T (Subway) - MBTA Subway Map

• Follow signs in airport to Shuttle to T/Subway
• Take shuttle to Airport T stop
• Take the Blue Line (only line at that stop) Inbound (fare is $1) to Government Center
• Take the Green Line one stop to Park Street. I forget if that's considered Inbound or Outbound here, check the map
• Take the Red Line towards Alewife
• Get off at Davis Sq.
• Exit station towards Holland St.
• Take a left on Holland St.
• Take a right on Irving St (a couple streets up)
• Take a left on Broadway when Irving ends.
• Take a right onto Mason on block up.
• 27 Mason is just up the street on the right.

By Cab
 
• Follow signs in airport to the Airport cab stand
• Take I-93 North to Route 38 (Mystic Ave), Exit 29.
  
• Go straight through the light at the bottom of the ramp, keep right and merge onto Mystic Ave.
  
• Take a left onto Harvard St about a mile later.
• Follow Harvard St until you come to a round-about.  Take the 3rd right off of the round-about onto Broadway.
  
• Mason St is the fourth street on the right side after the roundabout.
• 27 Mason is just up the street on the right.

Driving:

From the West:

• Take I-90 East towards Boston
• Get off of I-90 at exit 14, I-95
• Follow I-95 North to exit 29A, Route 2 East
• Follow Route 2 East about 6 miles to Route 16 East
• Take Route 16 East just under a mile to Broadway.
• Make a right on Broadway.
• Pass through 3 traffic lights and Teale Square.
• Take 2nd left after Teale Square onto Mason St.
• 25-27 Mason St are on right side of road


From the South:


• If coming from west of New York, take 84 East through Connecticut to the Mass Pike.  Follow directons from the West.
• If coming from south of New York, take 95 North, pick your favorite route past the city.  Then take 91 North through Connecticut, joining 84 East at Hartford.  Follow 84 East to the Mass Pike.  Follow directions from the West.

From the North:

• If coming down 95 take 95 South to 93 South (Exit 37A, I think)
• Take 93 South to Exit 31 which is labeled Rt-16 East.
• Take the first right towards Somerville
• Go straight through the light onto Harvard St
• Continue straight through a number of lights until you reach a rotary.
• Enter the rotary and take the third right onto Broadway (the right is just after a funeral home)
• Take the fourth right onto Mason St
• 27 Mason is just up the street on the right.