Until just recently, I lived on site. I enjoyed it, as it gave me an even deeper investment in the community. I worked very diligently with my residents to help them understand what merited a knock on my door versus a phone call.
My philosophy, as I communicated it to them, was that I would happily answer a text or call, but my home was my space, and my time with my family was precious to me. If it were an emergency, knocking on the door was okay, but any non-emergencies were to be handled during business hours.
It took a bit of time to get that rule established, but once I got it in place they were really good at abiding by it. I'd see them when I would get mail, or when I walked my dog, and we'd chat as neighbors. If they brought up an issue, I'd ask them to text or email me to ensure I would be able to address it accurately. "My memory isn't what it used to be; if you'll email that to me, I want to be sure I get it right!"
It would get a laugh, and still keep the separation of work and home where it needed to be.