There is an online map at https://www.uwa.edu.au/campus_map. Once there, in the window below 'SEARCH' (in capitals) enter: weatherburn This will put a balloon in the centre of the Weatherburn Lecture Theatre. Keep blowing this up until you get a nice sized image. If you click on satellite, you might just be able to see that Weatherburn is a free-standing rectangular building just north of a larger rectangular building with a tree growing up through its centre. MLR1 is on the North West corner of this larger building, i.e. immediately South West of the balloon. I used to leave the door of MLR1 open, but what was a door is now a floor to ceiling window, and the room is now air-conditioned. Hopefully you will see some activity in the room through that window. I describe how to get to that carpark below.
The first thing you need to locate is the University's Fairway Entrance No. 2.
Once you have turned into Fairway Entrance No. 2, the large building immediately on your right is the Electrical Engineering Building. Just past that on your right is Weatherburn Lecture Theatre. A good place to be dropped off is the carpark near Weatherburn. Then walk to the North West corner of the building just behind Weatherburn, and you will have found MLR1.