They were based at Mascot, although in the latter days the remaining one (ECE) spent most of its time at Avalon where it did base training and licence renewals for B747 S/O's. One instructor actually moved to Geelong to live as did the guy who ran the operation there. The other instructors commuted from SYD as did the line pilots. Down to MEL and then by QF minibus to Avalon and any overnights were in Geelong at the Travelodge and before that the Carlton.
When they first arrived, all base training was done at Narromine. Up to Dubbo on Airlines of NSW F27 or F28. The taxi guy from Narromine would pickup and convey pilots to Narromine where they would stay in the local hotel run by the wife of White Russian immigrant who had unexpectedly died. The pilots stayed in specially constructed rooms out the back (reportedly built with QF financial assistance) which were initially for Constellation and DC4 base training. I can"t recall whether the Electras did their training there as well.
At Narromine, anyone doing night flying had a standard instruction to help themselves to the big container of soup in the kitchen, and were free to cook themselves anything from the fridge that took their fancy. The bar closed strictly at 10pm but there were always other "provisions".