[http://bibliotheque.equipement.paris.fr/ Libraries] offer free internet. If you have your own laptop it's practically unlimited otherwise it's free just 15 minutes using library's computers.
On the Avenue des Champs-Elysées Élysées there are two fastfood fast-food restaurants called Quick, they have free-WiFi and also electric sockets and the personal personnel is not going to bother you becouse because of their use.
== Useful links ==