Sirius would be due south just after midnight this time of year for most observers in the Northern Hemisphere . . . directly overhead from 16 degrees south latitude.
Just saw this post pop up again, and went out to look, twinkling away there now in the same (ish) spot. The only other thing I can see now is another quite bright 'star' due east and a lot higher up in the sky.
If it's bright, high and due east it's probably Aldeberan you're looking at (the "eye" of Taurus, the bull. It's normally considered to be reddish though.
Don't know if you get Star Walk for android - on the ipad it will actually orientate to the direction you are facing and will actually overlay the star chart on a view of your sky using the built in camera.
You can also get a star chart that you use by holding above your head
Venus is currently shining way brighter than anything else at the moment, almost spacestation bright. I don't see how it could be mistaken for other planets or stars.