Our stay in Giardino Segreto was wonderful. The elderly man running the place, Mario, is super super nice and helpful. He only speaks Italian, but we managed to communicate :). As he lives in one of the flats, he is always here and available. The little bungalow is exactly as shown in the pictures, very clean.
What was not so nice is the fact that Luca (never saw nor heard of him) never answered my messages on Airbnb and gave me no information about how check-in would be. I would have liked a bit more transparency about who runs the place. Because of the nature of Stromboli island and boats being often cancelled, I would have liked to communicate with the host in case we could not come on the island. Something to improve for the future! That is why I give only 4 stars.