Last year 80,000 people in the UK listed their property on room bookings site Airbnb, and London has become one of its fastest growing markets. The majority of its millions of users have positive experiences, such as Peckham mum-of-two Leah, who rents out her spare room from £40 a night, which provides valuable extra income and allows her to spend more time at home with her kids. She's hugely positive about the whole experience but others aren't so lucky. Airbnb: Dream or Nightmare?