Like NancyIL, we will be renting an apartment from Vacation in Paris. I have booked this apartment for October:
http://www.vacationinparis.com/apts/id_158.htm After looking into what seemed like hundreds of apartments, I wanted an apartment that was both close to the RER A line, which is the train to DLP, and also convenient to major attractions. We will be in Paris for a one week, two of those days at DLP. What's great about Vacation in Paris is you pay in US dollars and they send you the keys before you leave on your vacation. I rented an apartment in the 6 eme on a previous trip but it was a hassle to rent in Euros. In my opinion, an apartment is the way to go. It's great to have extra room because European hotel rooms are super small, plus having a kitchen is great and you can really cut down on costs eating some meals in. Gives you more money to spend at Disneyland.
Have fun whichever way you decide.