I booked this boat with another 8 people and we had a comfortable stay. The boat is larger than it looks and the living area is comfortable. You can definitely have over 12 people and still have enough room. The toilets and showers all worked with hot water.

The only downside was that there was no working WiFi as the boat had to be moved to another location a week before we arrived. Fortunately we had a few people that had good data plans so we could browse maps and book events.