1 bedroom appartment in Stuttgart needed

Hi all.
I am about to accept a job offer at an advertising agency in Stuttgart and I'm thus looking for somewhere to live. I am not able to pay much more than 500, maybe Protected content , and I'd like it to be furnished.
Does anybody in this group have any info about something like this? Preferably I would like to be in walking or biking distance, but If I could get something cheap and nice outside the centre, it would need to be somewhere near the S-bahn or U-bahn as I don't have a car.
All tips appreciated!