Well done! I think you've hit it on the nose. Don't really need to see a map, especially if it isn't to scale. Your Wiki idea is pretty good. If it could also include reviews for which direction the room faces that would be great (facing beach, busy street, row of trees, next door bldg wall, etc.)
The only reason I even commented on this topic was that I tried synthesizing all of the Palmer House Chicago room information once, but it was just way too scattered and way too disorganized to be used efficiently as a room review.
BTW,
http://www.roomguru.com/ is available
Nope,
http://www.roomguru.com/ was grabbed over five years ago. I'm sure some creative type can come up with a brief and memorable domain name. The trick would be to find someone with the time, skills, and energy to put it all together. Getting more than two out of those three can be quite rough!