To access the Ikebukuro campus of Rikkyo University, please refer the following link.
The workshop site is the room MB01 in the basement floor of the McKim Hall (Bldg. No. 15).
The map below shows the campus map. The orange arrows show the access to the McKim Hall from the University main gate and the McKim gate.
The map around the Rikkyo University can be found at the following link.