Can i rent a room from somebody other than the landlord?

Basically anyone you rent a room from IS your landlord. Now, if you're talking about renting a room from someone who happens to be renting from a landlord, it depends on whether that landlord allows the tenant to rent a room to someone else (this is called subletting). I would be very careful about renting a subletted area from a renter. As a subletted renter you dont' have any rights as you would if you were a normal renter. The actual landlord may not allow the renter to sublet, and the renter could be kicked out, as can you!