Hello @Marja66
Yes I can imagine that this enquiry must have set your heart fluttering😊 As tempting as it might seem, it's best to keep a calm approach to begin with and vet this guest as much as possible before accepting a potential booking.
Long term stays and terms on Airbnb are different to short term lets and guests can shorten their stay by giving you 30 days notice at any time so this one year let may not go to term. Here is a great link to a recent updated guide on "Everything you ever wanted to know about long term hosting"😉
https://community.withairbnb.com/t5/Community-Guides/Monthly-Stays-on-Airbnb-Guide-Revised/td-p/2031...
And yes, definitely put in your ground rules! A lot of hosts put in a mandatory clean (fee applied usually) so that they can keep an eye on their place. Any invasion of privacy will probably not go down well with the guest and any hint of unauthorised inspections will get you suspended.
Keep the conversation going with this guest to sus out if they are legit or not and if they ask you for a video of your place, this is more than likely a scammer. Use the search bar here on the forum to see all the posts on the subject!
All the best
Joëlle