@Inna22 , when I am away and will not see the guests at all, I make sure that they know they can reach me at any point by messaging, phone, text, my husband's number (if my phone has to be off), whatever works for that particular stay. I make sure they know it is no bother at all, and that I am happy to answer any question.
So far, I have not seen a difference in the reviews of those I meet myself and those I do not.
I do find it easier on me to meet them, so this is my preference, but I think if you continue to communicate well, being busy won't be a problem. I understand your concern. I worried the first few times.
I'm absolutely with @Anonymous about not begging for five stars. When it comes up in conversation, as @Sarah977 finds, then of course, but otherwise you have to be very careful, I think.