Looking for a place for 4 months in Paris

Hello , I will be an erasmus student in Paris in fall term , my school( Sciences Po ) is in the 7th arrodissement so I preferebly looking for a room or a studio or a dorm near 7th arrodissement from 28 august up to 21 december , I am sociable and easygoing also respectful , I am a Turkish girl 22 years old , I want somewhere cheerful but also clean and respectful , I can stay another arrodissements as well but the place must be in Paris not in outside of the Paris and I want a safe place and also a place that I can walk easily at nights , I can share an appartement with girls , I am open minded , I like to have fun