SecSE 2017 is held in conjunction with the ESORICS 2017 conference. Please refer to the conference site for more information on the venue.
The following is copied from the conference site for convenience - check the authoritative version before making any decisions!
Address: Dronningensgate 4 Kvadraturen, 0152 Oslo
Google map: Map to the venue
GPS coordinates: 59.908613, 10.744499