If you do find a temp boat consider the seasons, if they change, where you will live with your own boat. Living on a boat in the summer here in the PNW is a whole lot different than living on one in the winter. Those long walks to the shower
can be a bear. And lugging groceries from the car. Or even more, from the store without a car.
We loaned out boat to some friends who were moving here this last year. They were looking for a house to rent and needed a place. I trusted them since they were long-time cruiser friends. They understood pumps, water, toilets, batteries, etc. I would NEVER allow a landlubber to stay on the boat!
But I think a short term stay wouldn't really give you that much of an idea of what it is really like to live on and depend on your own liveaboard
And a liveaboard
overseas or truly moveable, i.e. you don't have transportation of your own, is a whole different animal than living at your local marina with your car handy. Trust me - you'll understand once you try it.
There are people living the "urban myth" but it is a hard life usually. You can't do what you want to do when you want to do it all the time. Owners can sometimes be despots. There can be more work than you expect. But we have known people who do it. Very big boats and not the circles we hang with normally.