I had a horrible experience with Viator. We booked a private tour 5 days in advance and received an email saying the tour guide would contact us the day before or morning of our tour. When I checked my email the morning of the tour I had a message at 1:47 am saying our tour was cancelled due to them thinking it was a fraudulent charge. Why would they wait until the morning of the tour! And, they could give no explanation they suspected fraud. So, at 6:00 am, we were making calls trying to see if we could still book the tour. After many frustrating calls with no help from Viator. They told us we could rebook 24-48 hours later which did us absolutely no good as this tour was booked for our last day in Korea. We were finally able to reach the tour guide, who was extremely helpful, but we then needed to pay cash for the tour. So, at 7:00 am, my daughter and I had to walk several blocks to bank to take out cash for the trip. Extremely frustrating way to start our day!! I will NEVER use this company again.