I put some real thought into the actual format I think is the best after listening to Goblin Henchman's podcast episode, 12 - Audio Dungeon | not that one, which puts forward an idea of creating a dungeon based on audio messages of dungeon dressing sent into his podcast. (His blog also has a post dedicated to the idea - Collaborative Audio Dungeon). My initial room description was around two and a half minutes so I spent quite a bit of time refining it down to a minute. And this process of refining lead me to rethink the format.
Currently I working along the following lines for my ideal room description format.
Events likely to occur should then be detailed.
Undoubtedly I'll refine this format as I get back into writing room descriptions but I think it's a good starting point.