It's in German but it should be still fairly easy to understand. Basically average rent for a 72m^2 two bedroom apartment with a new constract is somewhere between 815€ and 1100€ within the SBahn ring.

If you are willing to share an apartment (which students generally do in Germany), you can usually get by with 300-400€ per month for rent.

For reference, a regular programming job should be around €1500 per month after taxes, while a month worth of supermarket food costs around €250 (although the right habits can shave almost a hundred from that). Add another €100 for a month of unlimited public transport, and you are set.