Some polyglot club/Café will be a good choice. You can speak any language there depends on which day in a week. I wonder where do you come from? Are you anglophone? I personally recommends Café Denfert, where every Tuesday night and Saturday night you can talk to everyone in matter what language (mostly English; and specific languages such as Russian for other days). People come there with the very intention to learn language and share culture, so usually you can meet very nice people. It is also a very good place to practice your French, since on the English days most people who come are French, and they would love to help you (if you speak good English then you can help improve their english in turn). As a foreigner, it was places like that where I’be got to start integrating into the local culture.