That's not a narrowboat...it's a wide beam Dutch barge.. that extra 5 feet of width makes all the difference to positioning the piano..
Our Narrowboat is 7 feet wide which is standard but ours is the 70 feet long, about 7 feet longer than the above Wide Beam.. we also have an en-suite bathroom , as well as the galley..all very usual things on a Narrowboat and much more so on a Wide Beam...
I'm surprised we've not heard of these 2 through the Narrowboat world.. I'll be watching out for their boat