Tidy up the common spaces (tables and couches)
Make sure the door to the courtyard is locked (give it a push)
Make sure all windows are closed
Turn off extra heating (like space heaters with fans)
Make sure no hacking equipment is left on (soldering irons etc.)
Turn the master volume of the sound mixer down to minimum
Check garbage bin and pant bin, replace bag if full
On your way out, bring full bags downstairs to the big bins
Leave bags of pant by the bins (they'll be acquired by a deserving human)
Throw garbage bags into the “Restavfall” bins
If the red (open/closed) button is glowing: push it to announce that the space is closed
Push “OFF” on the IKEA remote to turn off the lights
Go into the hallway, and make sure the door is closed behind you