Do not use Booking.com
I booked six nights at a place called The Studio in Arundel, England. Six nights, two nights off, then one more night for Thursday 6/18. The Studio is an apartment; when I came back on Thursday at 4:00 in the afternoon, I simply opened the lock box (of course I knew the code) and went in. At 10:00 that night - I was in bed - the owner of The Studio knocked on my door and said that my reservation had been cancelled by Booking.com ('invalid credit card') and that someone else had booked the flat. She made me leave. I'm a 74 year old widow! She said she would take me wherever I wanted to go. Of course, I offered to pay for the night again and said the person who had booked it could go across the street to the Norfolk Arms. But no, I had to leave. I called my cousins who live very nearby and they took care of me for the night. When I arrived home, I disputed the 'invalid credit card' with my bank and received a credit. It's appalling that Booking.com made such an egregious error. By the way, they did send an email about the cancellation, but it was to my travel agent. I did not see it, obviously. User's recommendation: DO NOT use Booking,com. Simply read the reviews about it and you will know why, along with my story.