Wow! What a wonderful experience! Our family of 4 (2 adults, 2 teenagers) had adequate room. Our son (15) chose to sleep in the room on the end with the bunk beds. Our daughter (13) slept in the tiny bed off of the master bedroom and while the bed was a bit short (which we knew going into the rental.....Hadewych did a wonderful job of pointing this out to us) she enjoyed having her own space. Part of what makes this a neat experience is being on the boat itself. My husband and I loved sitting on the deck (at one of the 3 different areas!) and enjoyed watching the boats go by and we all enjoyed eating gelato from the shop just across the street on deck after a long day of sight-seeing. Our children noted that the visibility of being on the boat with people floating by somewhat constantly took a bit of getting used to. Chalk that up to being American perhaps?! Overall, we loved our stay and would very happily return!