Transcriptions is held at Spontaneous Celebrations, which is at 45 Danforth Street in Jamaica Plain, MA 02130 (opens a Google map).

If you're taking the T:

• Take the Orange Line to Stony Brook
• Exit the station onto Boylston St, turn right on Boylston
  
• Cross Lamartine Street (the big intersection with the traffic lights)
• Go past a liquor store on your right, and turn right on Danforth Street.
  
• Spontaneous is the big yellow building, up ahead on the left

Google estimates the total traveling distance at 469 feet.

You can zoom out (click the minus sign, at top left within the map). 
You can also click-and-drag to move the map around, to see where JP is in relation to the rest of Boston.
Good luck in your travels, we'll see you there.