22 Year Old Man Looking for Accommodation in Paris!

Hello! My name is Max - I'm a 21 year old, American student of architecture doing a stage in Paris this summer. I speak fluent English and Spanish, and *almost* fluent French. I need a place to live from June to August. My job is in the third arrondisment, so ideally I'd like to be in the central city or at least someplace where I could reasonably bike to work. I'm only an intern, so I don't have the most flexible of budgets. 650 would be my absolute maximum - though lower would be ideal. Hopefully, my winning personality makes up for my lack of budget. I'm a good roomate, keep clean and all that, and love having fun after work or on weekends. Let me know if you have anything!