You're going to Shaffer Hall, room 101. Shaffer Hall is near the Baltimore Museum of Art, toward the south side of the main JHU campus ("Homewood").
Parking: The easiest thing is to park in the "South Garage". We can reimburse the $6 for parking in the garage. More info. (If you choose to park on a metered spot behind Shriver Hall, that'd be fine and reimbursable and $6 as well.) (Bring a receipt for reimbursement.)