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I like the idea of "northeast" not only for brevity's sake but for a better sense of realism. Let's look at it very simplistically:
There's a wilderness area with 4 rooms in it (told you this is a simplistic example). You are in the southwest room. You see nothing to the north, nothing to the east. You can't see to the northeast, even though its corner touches your corner. You -should- be able to get some idea of what's there. If there's some big bad nasty vile UberTerror of Doom waiting for you, you -should- be able to see it from your corner. And - it -should- be able to see you too, especially if it's an aggro mob.
In games that let you see more than 1 room away, you should at the very least be able to tell what is only 1 room away. And northeast is only one room away from southwest. From a very logical, pragmatic, and quasi-realistic point of view, you should be able to see what's there.
If your game doesn't provide the means of looking to other rooms it doesn't really matter. But if it does, then it does.
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