I never use room numbers on a jack. (At least not anymore) If you're looking at a jack, chances are good you already know where you are. Use patch panel numbers, or a combination of closet/rack/patch panel numbers, depending on the size of the install.
Your labeling scheme should make sense to anyone, not just the person who did the installation. There should be documentation left at the patch panel side.
Never use someone's name for a label...Bob won't always be in that office. Even room numbers can change.
Labels should be the same on both ends of the run. (where possible) You don't want to put room numbers on the patch panel and a patch panel number on the jack.
Unfortunately I've really only learned some of these things in the past few years, so there are a bunch of mistakes in my past.
