Click on the 'Classic Room' tag on the website. They are 22 square metres. Let me put this in perspective - there is about 2 feet of space around the edge of the bed, and that's it! A decent sized hotel room is normally about 40 square metres, for comparison, and I've had bathrooms in some hotels (eg FS Provence) bigger than 22 sq m!

You cannot get TWO people into a Classic room happily. I stayed in one on my own and found it really cramped. A couple would be killing each other within 24 hours!