Out of curiosity: wha tkind of rooms are even available in the attached hotels downtown? Is it just the kings and the (apparently mythical ;) ) double queens? I was wondering if it was possible to stay downtown without a king...I really don't need that much space if I have a room to myself.

Yes, there are plenty of standard hotel rooms, with the type just the same as you would find at most any hotel, a mix of doubles and kings.

Most hotel rooms are either kings or a double/double or a queen/queen.  I can honestly say I've never seen a normal hotel room that only had one queen.

Yeah I've almost never seen a normal hotel room with one Queen.  I've occasionally seen ADA rooms with that, and I've occasionally seen very large suites primiarly suited for entertainment have just one.  But it's very unusual.

When the Le Meridien was The Canterbury, there were a few smaller rooms with just a Queen (which is what I got my first year at GenCon).  I don't know what the rooms are like now.