Thank you Audrey! It was nice to have a space for my own to sleep, cook and take a shower. The room is really small, but he contains everything you need after a day walking trough Paris. I always let the window open and was surprised how calm it was during the night!
I recommend not only use the metro but also use vélib (http://www.velib.paris.fr/). Like that you are fast in the city centre and see on the way something from the environment.