Hi,
It was apparently around about where McDonald's is today, if you go to google maps and zoom in on Clase road, then Foundry rd you'll see McDonalds, I think it was around about there.
There are probably photos of it in w Glamorgan archives, I think the street may have been cleared in the 40's or 50's sometime
You 'll find the street on the old maps
https://www.old-maps.co.uk/#/Go to the Morriston area on Old maps and look for Tir-penry on the right, and you'll find Temple Terrace. It's down a bit from there and up a bit from the chapel.
The Below image is a map that I cropped down for you to show you Temple Terrace : (It's just a small portion of a map ,just to show you where it can be located ,so that you can find it yourself on the larger maps )
Hope that helps
Kind Regards