The official hotel of Planet Comicon 2013 is the Marriott Kansas City Downtown. The address is 200 West 12th Street, Kansas City, MO 64105. Rooms are currently available to reserve at a special con rate for use between April 2 and April 9. The room rate is $129.00 per night plus tax.
The dedicated website for con attendees looking to make reservations can be found here: https://resweb.passkey.com/Resweb.do?mode=welcome_ei_new&eventID=10440438
Alternate hotel locations can be found here.