We tried the bunker room with 4 people. It was a really small room so don't go in if you're claustrophobic! The clues were mostly easy. Lots of little switches and electrical fixtures. They give you one clue, which we had to use.
My personal first win at an escape game (1:2 at the moment) and it was pretty enjoyable! Will be back to try the Bio Lab next time for something harder.