Happy Hill is one of those places that you would never notice on your own. You have to be told about it, usually by a native Calgarian (if you can find one.)
But once you know where it is and discover how great the food tastes, then you'll never have any trouble finding it again.
Now about the food, It is seriously good, but usually I have no idea what I'm eating. If you think you like Dim Sum (usually shrimp and combination of about 1000 different things), then bring a Dim Sum-educated friend with you and let them order. That's what I always do. I'm not sure what it is, but I like shrimp, so I usually leave happy.
Dim Sum is pretty much a group activity, so they have big tables good for up to eight people. Usually there is about 6 or 7 of us, so that leaves us lots of room. Plus once the bill is divided between seven people, the bill is rarely over $10.
Parking tip: Make sure you get there early, the parking lot fills up and it will be tough to find a place to park.
This is easily one of my favourite restaurants in Calgary....as long as I have someone that can order for me.