I came across this place about a year ago. I randomly walked in, enticed by the "Montreal Smoked Meat" sign outside. I was pleasantly surprised by not only the food, but the decor and the staff.
The restaurant is tastefully decorated. It's not over the top like other retro diners tend to be. The woodworking is worth the trip alone.
The staff are always very friendly, they are often chatting with customers when not serving someone.
Now the food... Like other establishments in Calgary owned by the same person, the menu isn't large, and it doesn't need to be. They seem to live by the motto of "do one thing, and do one thing right". At POE, they do Montreal smoked meat, and they do it right. You are invited to choose from a nice selection of mustards to add to your pile of meat. The meal comes with some Old Dutch chips and a small container of slaw (not mayo based, so thumbs up from me). Although chips and slaw don't seem like a great side, they allow to focus on the great sandwich you are about to enjoy.
I highly recommend Palace of Eats, you won't regret it.