I know a couple of people who have sold up and bought a narrowboat, one being my ex wife, who bought a new hull and had it fitted out. She loves it and wouldn't go back. It is something that interests me and i was watching youtube videos at the weekend of people who have taken the plunge. One guy said that the first thing people ask is about what it's like in the winter and he said basically, you put the heating on or woodburner or both, the same as you would if you live in a house. He also said that he travels around and doesn't have a berth. You can stay in one spot for 2 weeks before you have to move on. Every now and again you have to tie up where there is access to water/fuel and waste disposal. I guess it takes a certain type of person and for every one that loves it, there will be someone who hates it.
Lack of a workshop would be my biggest bugbear.