I live (alone) on a small sail boat, 30 ft. long but only 8 ft. wide at the widest point, approximately 120 sq. ft. if living area. I have an ice chest size refrigerator, a Laveo Dry Flush toilet, an alcohol two burner stove, a small sink but no running water (I store my water in 5 repurposed empty ammonia bottles), and I sleep on a Coleman air mattress using beach towels for my bedding. I do have 120 volt power and therefore a windowless two vent air conditioner when I am docked in my marina slip. I am completely comfortable.
Because I am in the Deep South I can wear quick dry cycling/swimming clothes most of the year so I can do my laundry in a 5 gal. bucket (air dry and I use ammonia or dish soap because they rinse out much easier than laundry detergents). I sometimes cook vegan dehydrated back-packer foods but mostly I eat peanut butter and jelly sandwiches so I have very few dishes to deal with.
My boat is usually docked at night in my marina slip on a bayou. The marina has some rudimentary amenities (a serviceable shower). And I am walking distance to a lovely walkable community with coffee shops, laundries, a library, several excellent restaurants, etc. What I like best is my million dollar location and view. Directly across the bayou from my boat is a State Park undeveloped wilderness area so I see alligators, osprey, eagles, herons, otters, deer, etc. almost every day. If there is a spot on this earth that is more of a paradise then people should not allow themselves to go there because they will only squander it with their presence.
What I like next best is that moving into this tiny, simple space forced me to give up most of my possessions. I believe that every possession caries some burdens for ourselves and at some future point for our heirs. Therefore I am striving to want and to have less.
There are lots of van-life and small RV trailer living YouTubes, both on and off grid (even some vegan ones) for inspiration and ideas. Also, I agree very much with the apartment living response and think that apartment living is probably more or as least as planet friendly as tiny home living.