I'm a native Marathi/Hindi/English speaker, moved to France 2 years ago for pursuing Master's.
You would be surprised that Marathi/Hindi language can be easy to learn. I'd be happy to teach it to anyone interested (grammar, spelling, vocabulary, pronunciation, discussions...). I have experience working with kids/adults in a summer camp and teaching Marathi/Hindi to 6 Kids and 3 adults in France & Germany.
FYI, many countries/states have Hindi/Marathi among their official languages in Indian Sub-continent and learning such languages is a great tool to explore hidden opportunities in various business sectors.
I am also trying to learn French language, so I do understand both aspects of teaching and learning any language. I am sure it will be a great experience for both of us ;)
Feel free to drop me a message if you have any question :)
To learn any language, it's recommended to listen conversations, try to speak it as much as possible and do various exercises.
I am always here to speak in Marathi/Hindi/English, making it very good learning experience for you in Paris.
It depends on the level you want to reach and how many courses you can do per week/month. In a few months, you will be able to understand simple conversation and to react on some topic/subjects.