The question of living with less appears to be trending. I have been watching cable shows on 300 sq ft homes on land so a small motor
boat like what you are looking at is not out of the question if your relationship is solid. Clearly eating drinking sleeping in a tiny space is a challenge yet at a marina you may find showers, restaurants, public meeting space and you are near a city which offers everything. If you want to experiment
, spend a week living in a motel room with a view ( or tent), cook on a camping stove and get your entertainment and news by slow wifi
What is the warmest and coldest it gets in your neck of the woods. It might play into your decision. Best of luck with your decision.