Actually, I'll throw in my 2 cents. Non-parallel walls is a huge factor. As stated before, a single room generally needs to be in the mid sized room category (not huge, but have some space). But a great trick with any room, is...if you can open a door to a hallway, stairwell, or an adjoining room and stick a mic in it, it's a great way to add some "size" to the sound w/o. You're not gonna get that full-bodied "every drum a few milliseconds later"-albini, kind of sound, but it is VERY tasty on the right application.
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