If you arrive by train:
From Porta Nuova Station:  take the underground inside the station -> direction: Bengasi -> get out at Nizza stop (2 stops)  or  you can walk (20 minutes walking) From Porta Susa Station:  take the underground inside the station -> direction: Bengasi -> get out at Nizza stop (5 stops)  
 
If you arrive by plane: 
From Torino Caselle Airport: The easiest solutions are:
1) the train to Porta Susa Station: https://www.trenitalia.com/en.html
2) the bus Arriva to Porta Susa or Porta Nuova Station: https://torino.arriva.it/en/airport-line-torino-city-center-torino-airport/
You can get the underground inside the station: -> direction: Bengasi -> get out at Nizza stop (5 stops)   
From Malpensa Airport: The easiest solutions are:
1) the bus Arriva (book online in advance) to Porta Susa station:  https://torino.arriva.it/en/airport-line-torino-malpensa-airport/
2) the bus Flibco to Porta Susa Station:  https://www.flibco.com/en/shuttle/bus-turin-malpensa-airport You can get the underground inside the station -> direction: Bengasi -> get out at Nizza stop (5 stops)

Taxi are always available at airport or station (or at 50 m from meeting venue): you can use Wetaxi app (or similar app) or call: +39-0115737; +39-0115730