Jerry,

Here is the easiest way. From Grand Central, take the 7 Flushing Line train two stops westbound to Times Square. Get off at the front of the train and walk through the underground passage to the Eighth Avenue line. Then take the C or E downtown to Spring Street. When you exit the station you will be on Sixth Avenue. Walk uptown (north) one or two blocks (depending upon which exit you use) to Charlton Street, and make a left turn. The school is on the south side of Charlton Street between Sixth Avenue and Varick Street.

Alternatively, you can take the 7 Flushing Line one stop westbound to Fifth Avenue. Get off at the front of the train and then change for the Sixth Avenue line. Take the B, D, F, or M train downtown to West 4th Street. Get off at the front of the train and exit the station onto Sixth Avenue near West 3rd Street. Walk five blocks downtown (south) along Sixth Avenue to Charlton Street and make a right turn.

Sixth Avenue is a northbound one-way street, so if you are walking in the direction of traffic you are walking uptown. If you are walking opposite to the direction of traffic you are walking downtown.

--- Steve