The suites at the DoubleTree are twice the size of a room at Disney's Pop Century Resort. It's 520 square feet versus 260 square feet (158 vs 79 square meters). That's a huge difference, especially for 12 nights.
The DoubleTree Suites is my preferred hotel when visiting Disney World. I stay there 12 to 20 nights each year. Any minor problems (dead TV remote, forgotten shampoo) get fixed with a single phone call. In the 80+ nights I've stayed there, I've only experienced one major problem. The hotel was evacuated due to a smoking microwave in a guest room and I missed a meeting. The hotel went above and beyond to try to help me, even though I think the fire was due to guest negligence and not a faulty microwave.
As
DisHmsklMom notes, there is a bus system, but it operates a little differently than Disney buses. Make sure you understand how it works prior to arriving to avoid surprises:
https://www.disboards.com/threads/disney-springs-hotels-bus-information.3653605/
Aside from extra space in the room, one of the other benefits of the DoubleTree Suites is that it's walking distance to off-site dining. You can walk to places like McDonalds, Taco Bell, Perkins, and more. What great about those places is that they have "normal" pricing. So, you don't have to pay $13 for a burger (with no drink) at the Disney food court.
Finally, the other benefit of the DoubleTree Suites is that it has interior entry guest rooms. While some people won't care, I hate only having a window that looks out on an exterior walkway. I feel like I have to keep my curtains closed when I'm in the room. Almost all rooms at the DoubleTree Suites have windows in both the living room and bedroom. If you're spending any time in your room, being able to have natural light is helpful.