It's true, it's one of the most tranquil places and in my opinion, you wouldn't feel like sharing it, because it's really quite big. I myself spent 3 of the last days there, along with my mother, and a family was staying to the house next to us. I didn't see them for the whole day. There was no fuss, they didn't complain and in fact were waiting in anticipation to meet their neighbours! But I understand this cannot be always the case.
However, I must insist on that...when I was ready to list my house, I specified the case about the two houses and the shared veranda EXACTLY where Airbnb promted me to do so, in the "house rules" section.
Anyway, what can be done now? I mean, the guests are not happy, therefore I am not happy, actually I am worried and what can be done to help now? I feel that I am right but I think that they feel they are in the right in their part too.
P.S. I'm really glad you liked the veranda, I'll be happy to welcome you - I'll make sure the veranda is all yours 🙂