Hello Amy, I rented, Illegally for four years, I understood the risks that LM has mentioned and took the gamble. I'm not prepared to either recommend or dismiss it because there are some compromises that you will have to make which challenges the standard landlord / tenancy relationship. First off, you don't have security of tenure on a boat, less so if it's illegally rented on a leisure moorings or a cc license. Secondly, things go wrong on boats more than they do in a home. Most of us have excepted that as the way it is, keep a load of tools and perversely enjoy tinkering with things. However, don't expect a landlord who will come around every time a fuse pops or pump starts making noises in the night. This forum helps with that stuff! Finally, it won't take long before you realise how much you are spending on a boat that isn't yours, yet you have developed an attachment to because of the work you have done on it.
If, like us you can get over these things then you will have a great time and probably end up falling in love with your neighbours boat and buying it....
As LM has said, just understand the ins and outs.
Good luck