Looking for a room to start a nest

Hey guys, I'm starting an internship in Berlin from September. It's not paying much so I'm looking for something within 400 Euros, preferablely within Berlin. But I'll most definitely consider other nearby areas. I know I'm probably being ambitious but I don't need Anmeldung. Just a bed and some space to put my feet on. If you have something, please let me know. I've posted in some other groups. But so far could attract only a few scam artists (calling them artist is probably a bit too liberal of me. I mean, if you do scamming professionally, at least make some effort to be good at it!) Anyway, I'll really appreciate any help. :) I mostly keep to myself and am matured enough to respect boundaries. But I'm social and friendly. I enjoy traveling and exploring foods.