@Catherine1718 I get guests like this occasionally. I also sell fine jewelry online and have customers like this. There are some people who are extremely nervous shopping for anything online, be it a few nights in someone's home or a diamond.
A wise person once told me to figure out how much my time was worth per hour and then limit contact with customers to ensure that they were not costing me too much in time. So that is my approach now. I am always very polite, but when the questions start to veer into territory I have already covered, I stop the conversation by saying something like:
"We are looking forward to hosting you, but are concerned that you may not be comfortable with your stay based on the questions you have. Please refer to our house rules and all the info in the listing to make sure that you are 100% sure of what we can offer, what our space is like, and which behaviors are limited on our property. If after reviewing all of that (its often helpful to do so on a laptop vice a phone as the app can be difficult to navigate) you feel this is not a good fit for you, please submit a cancellation request. There's absolutely no hard feelings whatsoever-- in fact, I would be happy to send you some recommendations of hosts in the area who may offer more of what you are looking for if you decide we aren't a fit. We want everyone to be thrilled with their stay with us and each host is unique, so the best thing for everyone is that you be sure that our space will be right for you. Our listing provides extensive detail to help make that decision. Thanks very much."