My search - How to know if an announce is available?

The announces that are not marked as "Non-réservable" or "Complet" are all available. Furthermore, if the application form appears on an announce, then it means that it is possible to apply.

Some owners may not have switched their announce offline, even if the announce is no longer available. If you don't have an answer after a week, continue to apply to other announces in order to increase your chances of getting a reply.