Awesome if you like staying close to the terminals
Stayed at Yotel Gatwick @ Gatwick Airport in London one night in late 2011.
The bad: There is absolutely no privacy. And no space to move.
The good: Totally awesome not having to plan for hours when to get up to catch bus/tram/taxi to the airport.
My rating: ♥♥♥♥
…Cozy, and fully useful. I would go back! I am in general sickly worried about not waking up early enough to work, appointments, and other engagements, so this on-location-hotel is perfect for a wreck like me. Totally fell for the concept!