Viator is a rich platform with many options and last minute inventory availability. We booked the tour one day before and the agent on the phone was amazing and helped us find the right tour for us. The mobile app is very friendly and gives you reminders and integrates with Apple Wallet very well for etickets. I wish they do a similar app for the actual tour operators though. There was a delay in receiving a response from my tour operator and I was told later it’s because Viator used emails only with operators and they don’t use a mobile app platform. Often, tour operators are busy with attending to customers and they can’t check their emails while driving or while entertaining customers. Eddie, the actual tour operator, was super great and very knowledgeable. He is also a very reliable and experienced driver. We felt safe as a family of 6 with him and my old mother and kids loved him. He is a kind person. Eddie was also very flexible and tailored the private tour to our personal likings. We highly recommend Viator and Eddie for your private tours. We didn’t end up going to Loch NES but went instead to Loch Lomond, Luss village and Glencoe Ski. They were all stunning