We're less than a block from the Central Square T stop, located on the Red Line.
Use the westernmost exit from the station. Walk northwest. Very shortly, make a left on Pleasant Street.
From I-93 Southbound, take exit 30 (RT-28/RT-38) to Somerville, and exit on the RT-38 S ramp to Rte 28/Somerville. Turn left at Mystic Ave, and bear right onto McGrath Hwy. Turn right at Washington, and travel a very short distance (.2 mi). Turn right at Somerville , left at Webster Ave., and bear right at Prospect St. Turn right at Massachusetts Ave (Central Square), and Pleasant St. and Pandemonium is one block north, on the left side.
From I-93 north, take exit 26 to Storrow Drive, bearing onto the ramp to Cambridge/Memorial Dr. Turn right at Cambridge St., and continue as it becomes Main St and then Broadway. Turn left at Portland St, and then right back onto Main. Main melds into Massachusetts Ave. Follow Mass Ave. North. Pleasant St. is one block past Prospect, on the left.
Take the Mass Pike to the Brighton/Cambridge exit. Go across the Charles River into Cambridge and take River Street to Massachusetts Avenue (River St. ends at this point, and Prospect begins; if you find you're on Prospect, you've gone too far).
You can find metered street parking all around Central Square, including directly in front of Pandemonium on Pleasant Street. We also recommend trying:
There are two metered parking lots nearby, at Pleasant and Green.
See Cambridge's map of parking lots and garages. We recommend: