I'll throw a hotel recommendation of my own in if you're interested in another part of town.
Hotel Montpensier. Adjacent to Palais Royal and just a 5 minute walk to the Louvre. Which also puts it in spitting distance of the opera house, the pompidou, the tuileries. Super convenient metro stations accessing 2 lines. The hotel itself is nothing amazing, but it's charming, friendly, and cheap as chips.
If you visit Mont Matre/Sacre Coeur, don't miss the Dali Museum.
For Disneyland Paris - PLAN YOUR MEALS! Can't stress it enough. Food options outside of the sitdown restaurants that take priority seating reservations are paltry, and the hours of those restaurant can be unforgiving. If you don't have your food scheduled you'll find yourself with really really poor options.