* Bad luck *
I think I had bad luck here. I came once and got an espresso that was ok, and showed potential. So I revisited a second time and then was convinced that they simply aren't consistent.
Service the first time was friendly, but a bit clueless as they couldn't get the cash register to work correctly. But the espresso was passable.
On the second visit there was a different team that was even more clueless. Again the same issues with operating the cash register, but also bad issues with the espresso. It was underextracted which resulted in a really sour and thin taste. Meh. I think their grind is a bit off, and perhaps their machine is also running below normal temp. Overall a very disappointing espresso. Photo: http://www.yelp.ca/biz_photos/deville-luxury-coffee-and-pastries-calgary-4?select=OUWWXWqteWlh7cVasfddWQ#xBiKb3eJwXsYU7QjhjXB0w