Parking at Kidani is under the building, the parking outside is the short stay, for when checking in etc.
You can park wherever you like there are no specific spaces for each room.
There are four elevators, two on each wing, so the spaces ear these normally go the fastest, but we were always able to park nearish to our closest one, but this was in October, i would imagine around Christmas/Easter then a space close to an elevator would be like Gold Dust
There is valet parking at both Kidani vilalge and at Jambo house, and i believe that it is free for people with a valid disabled badge just need to pay the tip. However i may be wrong about this.
However getting between the two is very simple. It is about a 10 minute walk between the two lobbies, depending on where your room is in Kidani, this could be a lot longer, or shorter.
All of the park buses pick up at Kidani first, then stop at Jambo, so you can ride these over between the resorts, to return Downtown Disney Buses pick up at Jambo house first, then go to Kidani.
There is also an internal resort shuttle that runs between the two hotels, and picks up and drops of right outside the lobbies.