Far too short and no design mode. Very disappointing.
I expected it to be at least 3 times the size, and once I completed the career section, quite fun in its own right, I expected to be able to start with completely empty hotels or even design the floor areas and number of floors, but in each mode there are the same hotels available with the same rooms.
Once you complete the "career" section there's very little point in doing anything else as you're repeating yourself. The only thing you can change is the objective, and even this is not completely flexible.
Very short, very disappointing and not challenging. If you really want it get the cheap PC version not the more expensive DS game.