As a host I wouldn't let you do this for a number of reasons @Dennis969
1. Doing so is a safety risk for the host. You could be a burglar casing the property.
2. I would have to block out the viewing date so could lose a booking
3. It's against Airbnb's T&C quite rightly as people asking to do this are often trying to take the booking off Airbnb so that don't have to pay the booking fee.
4. I would have to pay for an extra clean if I let you look around the property.
5. You don't need to see the inside of the Airbnb before booking your trip millions travel safely with Airbnb and other short term rentals without doing so.
If you only want to use properties you can visit in advance why not do a direct booking with a hosts that offer this and ask them if you can visit.