Hi @Simon-And-Helena1 I hope you're well!
I have a "Ring" brand camera doorbell installed at my property (I host a private room and live on site), and it has been brilliant.
I actually got it because the entrance to my apartment is slightly hidden around the side of the main residential building and is hidden from view from the street and could be the ideal spot for a break-in to go un-noticed.
It actaully is amazing as I can see when self check-in guests arrive (even though I ask them to let me know when they enter, they often forget as they're exhausted/excited), I know when guests are home or not home for safety, and I can see if a guest is having issues getting into the apartment- and I can talk to them through the doorbell- where ever I am!
Recently a guest couldn't get into the apartment because the lock was stiff- it was cold! So I talked her through it whilst I was at dinner with a friend, no panicing guest and no need to return home.
I guess that's where the Ring is good- it's not passive- you can communicate through it, and for me at least it feels safer with it. It's on my listing and I tell guests about it when they arrive- and they are usually always interested in it and how it works.
It just adds another layer of security in a rather non-threatening way!
Paul 🙂