Definitely one of my fave spots in Vienna - you can't go wrong in a place that offers nice food and drinks, free WLAN and resides inside a building that used to be one of Vienna's biggest private toolshops.
I guess one can definitely call it one of Viennas netculture reallife hubs.
The other tupalo users spoke out already: On is a fantastic restaurant - in my personal opinion the best in Vienna by far, if you take the price range into account. Gotta go there more often.