24 year old guy, looking for acommodation in geneva for minimum of 6 months

I am a 24 year old spanish guy who is going to Geneva for a 6 month internship in an international organization from June onwards. I am looking for an apartment room or a studio that is well conected to the city center and/or central station. If sharing an apartment I prefer people that are already working or during their masters. Im responsible and very easygoing, looking for friends too :)