If iam travelling to work in USA, alone without my family, and I dont want to rent an apartment or studio, is there is the option of renting only a room and how much does it cost?
Housing cost in the US varies by location. The middle of a big city or developed area (like Silicon Valley) will be very expensive, while smaller cities and towns will be cheaper. Craigslist.org is a good resource for shared housing.
I just looked at CraigsList for San Francisco, California. The cost for renting a room in a shared house ranges from $800/mo to $3000/mo.