The visiting students stays generally coincide with the summer holidays and as well as lessons, the schools offer recreational and cultural visits which means the students will be out and about all day.
Good host families within proximity of the language schools are always much sought after. Host families will provide the host students with bed and breakfast and an evening meal. Some organisations will require a packed lunch to be provided for their students.
Students may stay from a few days to several months depending upon your agreement. Hosting students if you have a spare room can earn you in excess of £5,000 a year.
If you are interested in earning an extra income from home and want to host students then check for your local language schools. There are also organisations which recruit host families and place students from different language schools. Here are two links to student exchange programmes which will help you get started;