First, thanks to Airbnb & Lizzie for reaching out to all of us.
We have hosted for 3 years and have found that once our guests book with us, we offer them a choice of "talking" via Airbnb which is normal up until the day of arrival when many people find texting short notes while traveling or even calling is the most immediate and good way to keep up with questions, when it's also important for knowing when guests are an hour out from their check-in time. We send messages/notes or our mutual cell phones. It's simple and has always worked well.
There has never been a negative incident or mistrust as we have obviously been blessed with really great people!
One thing that we have always done is keeping the communication from our guests open as we want to make their stay wonderful and respond to their needs quickly if there is anything amiss. We welcome them in person as a rule but if that isn't possible they are guided by us with directions for self-check-in and we offer them privacy and also personally meeting the following day. Leaving our rule book out in plain view helps answer details about our home, wifi, phone numbers again, and a repeat of safety and details they may not have read when first booking with us.
Our Airbnb is a private, keyed, and gated entrance in our own beach home. We have hosted many new Airbnb members, and usually if we are prepared and communicate well they are guided through so that they may feel at ease and go on to having what several have told us in notes they leave behind , an experience here and our town on the shore that was more than just a great trip but they made memories together with their family or friends together.
If we keep in mind why we are hosting and always remember that this time in our space is about them first, and not ourselves making money , it will be reflected in our own experience and in their feedback, ratings, etc, which is there as the learning that we all can see and use to improve our Airbnb, without being defensive .
Best of luck to everyone!