The K21 is renowned for safe handling, gentle stall characteristics and a reluctance to spin or flick roll even when roughly handled.
The trainee seat in the fore cockpit is comfortable and allows the wearer to relax in their parachute - allowing the early pilot time to focus on enjoying themselves.
A robust airframe with strong undercarriage means that the maintenance overhead won't blow the training fleet budget - and all those bumpy landings will be brushed off with ease.
UPDATE: The pilot is a bit of cuteness too, don't you think? If I offer some help with the Joystick in the Cockpit, do you think she would give me her phone number?