That makes sense to me - the word yacht might be implying too much a certain use case (it's the name of a class of vessel but I think it also says 'rich people toy' on first impression). But house boats have been around for a long time and when they're someone's primary residence they sometimes represent a cheaper model of living, not unlike a mobile home. An airship houseboat is an interesting idea, I think it showed up at the end of Cory Doctorow's Walkaway.