Starting a life in Hanoi and need advices

Welcome to the forum...

I suggest that you read through the many informative posts on the forum first for information and advice.
Then perhaps ask specific questions.

Hi, Roldo. Welcome to Việt nam. I already had a friends who come from france. I know for sure  the answers for your questions.
1. About to rent apartment with 200 us dollars.
It's depend on your demands, for me. I'm a student at HN university transport of technology. and have just graduated . Now,I rent a house with my sister and my brother. I have to pay 700 vn đồng ( about 50 dollar each months), but we are deferent .  in ordinary, the cost about 200 to 500 dollars for an apartment or a house including the water cost, elictric cost. U can access some websites for housing and property to find out the apartments that U want to rent. Maybe, I can help U when U come to Viet nam.
2. Too much of english center are growing up in HN at the moment such as: Apollo english center, British Council, or local center such as: Headstart, smartcome viet nam, ..... U can apply to this english center or teaching at home or become a tutor with high salary. I don't know it's easy or hard to U apply to these english center, it's depend on your ability.
3. About social life
Viet nam's one of the most peace  country in the world. Vietnamese is kind and friendly. Viet nam have great dishes and beautiful sites and U should try to experience the Viet nam's culture. Don't worry. I think U will get used to with social in vietnam soon.

Hi Guys!
thank you very much for your posts I am already in contact with several english teaching schools.
Really looking forward coming to Hanoi this november.

You're welcome.