Porte Maillot is the first stop. And I do agree with ILuvParis's advice as a reasonable price compromise.

Note also that a different Air France bus goes to the Gare de Lyon train station and then to Montparnasse (across from the Meridien hotel). Taxis are readily available at both of these locations.

Depending on the location of your hotel, you might find this bus better suited to your needs. (Gare de Lyon has good access to the Republique area; Montparnasse is close to St Germain des Pres.)