Hi. I know this is a serious thread mine and you may be no longer following, but you can get a low-res aerial view of the house taken in 1943.
The Subiaco houses were demolished by Rheem in 1961. Your unlikely to find much information on the Coachmen's house, as no information or photos was kept on the cottage near the mansion that was the original 'Vineyard' built in 1792.
Anyway to get the image of the house,
1 Type 'six maps' into Google. It's a NSW Govt Lands site. (
https://maps.six.nsw.gov.au/)
2 Enter the address in the top left search box. The current satellite view will come up. Zoom in. then
go to the top right box marked 'Base Maps'. You will see a mention of 1943 map, Click that and select 1943....you can alternate from there between 1943 and current.
You can use 'print screen' to save the images to notebook to save them.
One suggestion after you have found it, enter an address in another part of the suburb so the red marker isn't on top of your subject, then go back once you know where it is.
Cheers and good luck