@Letti0 As I just host a private room/ private bedroom in my home with use of the kitchen and outdoor spaces, and only host solo travelers, I have never felt the need to have a rental agreement nor ask for ID.
As far as the ID goes, it's only ever one guest at a time, and they have all, so far, had clear profile photos (no cartoon characters, kitty cats or close-ups of their tattoo) and were easily identifiable when they arrived. (Except for the one I thought was a cute long-haired guy in his 30's who turned out to be a good-looking woman in her 40's, but still, I could tell that was just my misperception, I could see it was the same person. We had a good laugh over it.)
I have only had 2 guests take liberties- 2 separate bookings of young girls who thought it was okay to bring their guy friend home for the night, in the middle of the night. I called both of them on it immediately the following morning (I wasn't about to get up at 1 AM and make a stink). In the first case, I ended up letting her boyfriend stay, as she was new to Airbnb and really wasn't trying to scam or disrespect and I charged her extra guest fee and they were happy to squish into the single bed together. The 2nd was an experienced Airbnb user, also a host, and should have known better. I didn't let the boyfriend stay.
I have reviewed each and every guest, except the latter one mentioned above. I was actually super busy, and didn't get around to it, nor did she review me. The other girl gave me a very short but great review.
In my experience, not just with hosting, entitled, pushy people need to be stopped in their tracks from the outset. They are used to getting their own way, therefore they have little initial respect for anyone. If they see that you are not a pushover right away, and you state your boundaries clearly, politely and professionally, they end up having more respect for you and will tend to behave better.
Hosts are much more likely to get a bad review from a guest who they allowed to be demanding and tried to accommodate their demands, or let things slide, or kept asking them politely every day of a 3 week stay to please leave the kitchen clean, because you've allowed those people to disrespect you and they will continue to disrespect you in their review. If they see that you're someone who is fair but can't be pushed around, they will show you more respect and will tend to leave a better review.