If this general info, isn't specific enough, you'll probably have to provide details about your friend's situation--what kind of visa they have, for what length of time, if they're planning to stay (mostly) in one place for the duration of the visa, if they're planning to work, if they're planning on renting a flat/room or staying in hotels, etc.
Better yet, if your friend has internet access, ask them to ask their questions here.
Because it's still very unclear. Does your friend just want an address of where to appear? We'll need a specific city, and if it's a large city, we may need the name of the street.