Anything illegal if you're living on a boat?

I am currently looking for a temporary place while I do an internship for 3 months. Been browsing different ads online and ran across essentially living on a boat.

At first I was like, nope. But it does fit location and everything I need terms of time and fairly good price for the location.

Thoughts?

Last note I did email the person whom is renting and exchanged numbers yet to have a chance to talk.

What questions should I ask??