Don't know if this helps but gunlukbasi is at the end of the road where the new carrefour/shell petrol roundabout is. Instead of turning left to head into Centrum just go straight over the roundabout (this is coming from Deliktas with Carrefour on your left). It's about 2 miles, straight road (3 or 4 traffic lights) and you'll come to Gunlukbasi Police Station on your right by some traffic lights