I am trying not to be unfair to the Hosts, but our experience with them was beyond terrible. Based on our experience you should not expect them to be responsive if you need any help at all, even in an emergency. Perhaps they can reply with a reasonable explanation.
We arrived and put our belongings in the boat without any trouble. Gaining access to the boat involves opening a huge security gate using a key stored in a lockbox. Later that evening (8ish) we stepped out to put in our names at the Sail Loft, a minute away. When we returned we found that someone had taken the only key to the gate. We were locked out. And it was cold. I phoned, texted, emailed, and used the AirBnB message system to contact the Hosts and never heard from them that night. They did not return any message until after 6PM the next day. We were stuck in the dark without our belongings and without any warm clothes. Our only option was to try and find a hotel for the night without any of our stuff. As I said, absolutely no word at all from the Hosts. You can imagine how upset we were, our weekend ruined.
To try and salvage things I finally decided to try and climb around the gate, which stretches down the gangplank and over the water. At 69 my gate climbing days are pretty much behind me but we were desperate. If you decide to go there, take a look and imagine what it was like hanging on for dear life in the dark on a cold Boston night. Maybe they should put that in their instructions. But I managed. Then it was up to us to track down the people who had the key since the Hosts were no-where to be found.
Here is the Text that the Hosts sent the next evening: "My apologies. I did not get the message. There are supposed to be multiple keys in the box."
I will leave it to you to decide if that seems sufficient.