@Josh1413
Josh, how did this booking come to you? I understand it was an Instant Book but, in their initial message to you did they explain fully why they wanted to book your property, or did you have to coax this information about floor finishing out of them.
1/.....I would not see a 19 night booking as a red flag if they are having house renovations done. I have just recently had the same thing here with a 3 week booking, it worked wonderfully.
2/.....Sure they are local but, this simply would become their home while their property was unavailable, it would suit both your purposes. The last thing they are going to do is have a party and risk getting kicked out!
3/.....The fact that they have only recently joined Airbnb is logical. They may have not needed to use an STR platform before, but with this renovation in mind they decided to join, we all started from somewhere with a reason for joining Josh.
I put guest enquiries into one of two categories.
A.......They like my listing, explain why they are coming and just want to stay. They are going to be good guests.
B/......They ask a lot of questions and are more interested in what they can get rather than what I provide. I stay away from them Josh, and suggest that my listing might not be a good fit for them.
As you go along you will learn what those red flags are, now granted I do not know the contents of your message stream with these guests, but I would see this as a genuine stay and good on you for snaring it.
What I would do though Josh (I have done it in the past with good results) is get onto Airbnb and explain to CS what you have explained to us. They will ask if you want to cancel the reservation. Tell them, NO, but you want it on file that this stay could possibly have issues and you would like a ticket number in case anything you can't handle crops up. That way you have got in the first punch and if something does go wrong you will considerably improve your chances of getting proper support! Some support reps won't do that because they don't like open tickets but most will do it if they can see you are genuine and are ticking boxes and are prepared to ask for help rather than demand it!
All the best.
Cheers........Rob