I just had my brother's common room rented out at $400/mth. Includes unlimited wireless internet access, aircon, walled-fan, Queen-size mattress without the bed (totally new) computer desk, 2 wardrobes, cloth-hangers, toothpicks even! lol

I saved us all hassle of getting an agent (cos i studied real estate). Agents can charge you half a month rent although I've seen agets taking a token sum of just $100 regardless of rental amount.

Master-rooms usually cost a lil more ($50 to $150). And location of rooms/apartments is a factor, those near amenities and the MRT or bus interchanges can command higher rental rates.

Let me know how i can help you with any info. I have a lot of time to spare since I hurt my right hand.