My only suggestion would be to not be so specific as to request a certain room. It sets you up for disappointment if you don't get it. If the one you want is not going to be available during your time frame, the room assigner will have no idea where to put you to make you happy. In general, limiting requests to general locations like "Martinique 25, second floor" will be your best option. The more specific you get with your requests, the harder it will be to get them.