thanks for the info (that is about Cafe Sud, not about having unsharable knowledge :P)
the website does not have the address, but thanks to google map, I found the address
rue Marterey 31
1005 Lausanne, Switzerland
I will try it out. I also discovered one myself, called Le Colony on ave du Theatre. very nice lounge.
There's also the shiva that is between bel-air and st-françois, the kebab shop next to the cafe sud also offers hookah, that's all I can think of at the moment.