You do check in via the MDE site not through MS. The MDE online check-in system has a page where you can list room requests. It is generally better to ignore that request page and put your room requests in via contacting MS (phone, chat or email). The issue is not whether it is more likely you will get the request granted, but the fact that you can make far more different requests through MS than those allowed on the request page provided with the online check-in system, a number of which are ridiculous. Example: at Kidani, the MDE online check-in system allows you to choose near an elevator but does not allow you to say which elevator (they have names, like Rafiki and Timon) There are three elevators along each wing, and unless you can name the elevator you want, a near elevator request can be met by putting you anywhere in the building. Similaily at Jambo, the online system allows you to request high floor, a completely pointless request for DVC since all DVC rooms are on the fifth floor, except for club level on the sixth floor.