Hi! We did it the other way round this summer - DLP first then Asterix. We stayd in teh Apparthotel in Roissy-en-France and would highly recommend it! We stayed 2 nights and did Asterix in between, but depending on your stamina and the crowds you could probably polish it off in 2/3 of a day (I don't think it stays open into the evening).
The apparthotel was just outside the town of Roissy, and we walked there to buy supplies - its a lovely town, with loads of dining options if you want to eat there. We also bought our Asterix tickets in advance from Tourist Information

The Appartments are air-conditioned and have one double bedroom and a pull-out sofa bed (which our boys 18 and 12 found perfectly comfy) with TV in both rom, free wifi, small but adequate bathroom (with toileteries - and much higher water pressure than DLP!) and a small kitchenette with full size fridge, 2 ceramic hotplates and a microwave. The breakfast buffet is 9 euro - it was nothing special, there's a mini-Casino just in the village square which sells everything you coud want including bread baked on the premises (bit like a better Tesco Metro). The crockery was a bit hit and miss - 3 glasses and one cup for 4 people but if you're not having a gourmet dinner party who's worried?! It was very spacious and comfortable (especially having been in one room for 4 nights with no wifi!) and we could happily have stayed another night or two and explored the area. There was no noticeable noise from the airport even though it is just the other side of Roissy.
Only about 1/2 hour drive to Asterix from here, and maybe an hour to DLP. In my view perfectly located! You could stp here overnight, do Asterix and then be in Disney early evening. As others have said, you do need to be able to speak more French. On the plus side beer is an option with the set meals in the burger stops! There are many dining options including a smart restaurant, but we wanted to eat quickly before the dolphin show.
We didn't find it that crowded (2 August), except waiting for rope drop - and yes there is a LOT of smoking, but then there was a lot in DLP as well (athough not as much). The shops had lots of interesting merchandise, and I wish I'd bought more.