When in Vienna in December 2018, my daughter and I wandered into a Catholic Church for Sunday mass. It was a very old church and not a highly decorated or adorned church, yet very quaint and very nice. From the outside, it did not look at all like a church. It certainly was no gothic cathedral. I took a picture of the altar after Mass. From the photo information, it is listed as "Neuer Markt 6, 1010 Vienna".
I am going back this December and would much like to find that church. Any help in identifying it would be greatly appreciated