If its about requesting to give visa...........u gonna request them to give visa to the person u sponsoring......and just clear the realtion...about him/her u sponsoring..... u dont need consulate address.....the person going to apply for visa should take your letter and show it during interview........ u must notify your address in letter saying u going to make arrangement of the person coming ........... and well information given by sirish too...are needed and helpful..