I am a foreign student, holding Cambodian passport and a Student Pass in Singapore. My bf's parents have invited me to visit China in February next year (less than 14 days) and i will be staying over my bf's house. He is now currently staying in Singapore with me here, also holding a Student Pass.
I wonder if i can ask his parents to write me an invitation letter as a proof of residential location instead of the hotel reservation? or is it a must to have the hotel reservation under this any condition? And lastly, can i just apply the Chinese Visa in Singapore?

Best Regards