From Boston via Central Square:
Take either the Red line or MBTA #1 Bus (towards Harvard Square) to Central Square.
Transfer to the #83 bus that leaves Central Square from the corner of River and Green Street . Take the #83 (towards Ridge Ave.) to Inman Square (about a 5 minute ride).
From Inman, walk East on Cambridge Street for 4 blocks. Take a left onto Windsor Street. Walk down Windsor past the lovely auto junkyard, and the orange JamSpot awning should be visible across South Street to the right.