It should be served at cellar temp, 50-55 degrees. I keep all my beers at 40 degrees, which is a little too cold for most of them, but that allows them to warm a good five degrees or so to where they should be. Of course, certain beers need to sit longer to get to a more realistic cellar temp. Room temp is too warm for most beers. I'll be adding a nitrogen/stout tap to my setup in the next few months. I'd love to be able to keep that keg at cellar temp, but, unfortunately, it's going to have to stay at 40 like everything else.