The boat is definitely a unique and very peaceful experience. The location is amazing and all the recommendations awesome. The outer deck would be great, if was not all wet from rain.
However you can hear all within the boat and it was pretty dusty and not so clean.
We could rent bikes but I would happy next time if we would have known that they cost something. I offer bikes as host myself for free. It was 7 Euros a day and the bikes are not the best ones and we had them just 3 hours. So just more info would be better.