Searching for a cheap/quiet 1-person flat [student/young professional]

I am searching for a one-person flat where I can focus on my research and master thesis writing. I am currently enrolled at the Technical University of Berlin (TUB) but will likely need to go to Potsdam regularly for work, so an ideal location for the flat would be with good connection to the S7 (either in Berlin or Potsdam). I don't really have any other requirements, I can move in as soon as 01.06 (flexible) for 6 months or longer (ideally 9 months or a year, also flexible).

My budget is up to 600€, depending on location. I can provide proof of enrollment to university, proof of scholarship and personal savings. As mentioned I am also planning to start an internship in the next couple of months in the field of UX design so money shouldn't be an issue, but if needed I can ask a family member to act as a guarantor.

About me : I am 25y/o, originally Italian (lived abroad for 6 years), well-cultured, quiet and responsible. I do not smoke and do not own pets, don't really go to parties. Hobbies involve cooking, drawing, tending for houseplants, walking and playing retro videogames.

My linkedin profile: https://www.linkedin.com/in/pietroromeo/

If you have an apartment for me, send me an email and I'll be happy to come for a viewing. I am currently living in a shared wg in Steglitz.