We are D.V.C. members who have A.K.V. as our home resort, and we love both Kidani and Jambo. As a matter of fact, we've split our last 2 vacations between the 2 resorts.
Kidani has it's own resort check in.
It takes about 10 min. to walk from lobby to lobby between Kidani and Jambo. You can take a bus, but be careful. All park busses stop at Kidani first, then Jambo, then go to the parks. So, to get to Jambo, hop on a park bus from the Kidani stop. The Downtown Disney bus stops at Jambo first, then on to Kidani, so you can take that bus to do that short jaunt. Never hurts to ask the driver to be sure also.
A few other random things:
Kidani has the awesome Sanaa restaurant (and bar), but does NOT have a quick service restaurant (a source of many complaints). You can get a (very)limited menu at the Maji Pool bar, and can also refill your mugs at the pool bar and the Johari Treasures gift shop. For full Q.S., you have to walk to The Mara at Jambo.
As for other amenities, I actually like the fitness center a bit more at Kidani (lots of glass and often fewer people than at Zahanati fitness), and the pool area more as well. It is a lot smaller than the Uzima pool at Jambo, but it has a great slide, is more 'quaint', and a great water splash area.
One other thing, as a D.V.C. resort, Kidani has a 'Community Hall' with pool tables, games, etc.
Enjoy...we always do. :wave: