I booked 3 separate nights at a property in Toronto. Soon after booking I got emails from the property owners saying (a) my reservation would be cancelled within 48 hours if I didn't sent money, while booking.com said I had until a week before each date to cancel; and (b) that I had to book for 3 nights on each stay though booking.com let me book for one night on each trip.
Will never use them again.