I've had a few over the years, currently I have a 36’ steel sailboat, it has a lot of insulation so it's cosy in the winter. I live ashore at the moment, but for 1 person 36' is too big even. I can shower with hot water (propane on demand heater and a 12v water pump), the toilet is small, I also hit the local pool from time to time for a shower. My solar + 4 golf cart lead acid batteries runs a small compressor fridge and a loptop. I sail it around the coast (bc gulf islands), but mostly its parked in its spot.