All WDW resorts have rooms with roll-in showers. These rooms are spread throughout the resort, in various categories of view/location. Other than theming, the rooms are fairly similar, so I suggest choosing what you like. Availability may vary depending how close you are to the travel date and how many others have already reserved accessible rooms.
There was very limited availability for late November 2016 when I called Disney to ask about a roll-in shower room for my parents. Definitely choose and book as soon as you can - I don't know when you're traveling, but the CM I spoke with at the reservations center definitely made it sound like there weren't very many roll-in shower rooms to begin with, and most were taken just about 7 months before our planned trip. Good luck!
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