I second that recommendation. I have a friend who had two great Danes and they were both very intelligent in discerning the hearts of men, lol...and very gentle and loving with family.
When I was young I had a lab/dane, and if they had filmed another Hound of the Baskervilles he would have been perfect. I’m like Butterbean and he could knock me down with ease...ginormous. But very gentle and intelligent dog.
I left the back door into the high fenced yard open 24-7, whether I was home or not. On his hind legs he was six inches taller than me, with the heavy body of the lab. I never got broke into.
Mine is quite gentle and polite with strangers too. I’ve never had any anger or truly fearful responses from any of the trades people or delivery people who often come here. Indeed, they all like him and my Pitador. Of course, someone who approached with evil in mind is likely to have a very different response to my two large doggies, and might well be seriously mauled by them if he tried to break in and menace me.