I will move in Singapore for work this October after 3 years in Shanghai, so I am looking for a nice place to stay in Singapore

My offices will be around the metro stations EW13/NS25 and CC3 (basically in Downtown), my budget is 1000-1500 SG$ for a flat sharing room (hate living alone)
So few questions I have:
- What are the main differences between the SG districts?
- I would like to be close to a Metro station, but how are the buses in the morning here? (ie trafic jam?)
- Is it easy to ride a bicycle here?
- What is the average budget for a flat sharing room here? I know it is a stupid question, but I just want a rough idea.
Thanks a lot for your feedbacks!!