Comment by frereubu

It's not just the front end though. I used booking.com to book a hotel room with my wife and daughter, and it had a label on the booking option saying "your child's stay is free!" or similar. Turns out that her staying might be free, but the bed for her to sleep in is £30 per night, which was an extra I had to pay when we arrived. Booking.com is fine for finding somewhere because so many places are on it, but in the future I'll always book directly with the location through their website.