Many possibilities of accommodations :

In Marne la vallée

IBIS de Champs sur Marne is the nearest (walk)


For the others you can use metro  RER A :

Novotel Marne-la-Vallée Noisy-le-Grand

Hôtel Ibis Marne-la Vallée Val d’Europe

If you prefer to stay in Paris

the best way is to chose  an hotel near near metro station  ” Nation ” or ” Gare de Lyon ” . You will reach Gustave Eiffel university by RER A at the station de “Université  Noisy-Champs “. 30 mn