Petra was sincerely caring and took her time to show us the place.
Tha accomodation is very well maintained and a great spot to start exploring Rotterdam from, and staying on a boat is just the unique experience you would expect.
Just an FYI: She is not waiting outside the bnb for the check-in, but inside (at least she did with us, so we were puzzled for 5 minutes until we called her) so call her right when you get there.