Supelec is reachable with the line B of the RER (same line as the airports Orly and Roissy Charles De Gaulle). You have to go to the RER B station called "Le Guichet". Once there, you have to get a shuttle that takes you to Supelec.

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PLEASE BE CAREFUL, not all the RER B trains will stop at "Le Guichet". You have to look at the train name or the information screen on the station platform. Here is the time table of the RER B :

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Trains called PLAN and PEPE stop at "Le Guichet".

Here is the Paris metro map :

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We propose some hotels near the RER station Denfert-Rochereau :

• Hotel du midi :
  Single Room : 108 Euros
  Double Room : 138 Euros
  Breakfast : 12 Euros
  
  
• Hotel Montparnasse Daguerre :
  Double Room : 89 Euros
  
  
• Hotel du Lion :
  Single Room : 72 Euros
  Double Room : 82 Euros
  Breakfast : 8 Euros
  
  
• Hotel Paris Marriott Rive Gauche Hotel :
  Double Room : 199/150 Euros
  
  
• Hotel Le Vert Galant :
  Room from 80 to 150 euros
  Breakfast : 9 Euros
  
  
• FIAP Jean Monnet :
  30 rue Cabanis
  75014 PARIS
  
  
• Residhome Bures-La Guyonnerie :
  1 Rue de la Guyonnerie - 91 440 Bures-Sur-Yvette
  Studio for 79 euros per night