I've hosted many friends via CouchSurfing in the past. It is truly awesome to meet people from around the world. Since I can't travel to where you are, I'm simply grateful that you are willing to bring your world to us.
This is a homestay. You will be provided with your personal room and a bathroom and access to pretty much everything in my house. While you are here, try interacting with my son and teach us more about your country/culture and travel experience. Other than that, I do not expect anything much from you other than your genuine friendship. You will be treated as a friend. Mi casa, tu casa, my friend.