Thanks for all the advice guys. I did bring things up with them a little bit last night, and we're still figuring things out. Our current lease isn't up until July, so I will be rooming with them at least that long.
As far as space concerns... well, without hopefully giving too much personal information, their business is a bit unique. ...they make fursuits. So a work in progress can be, literally, the size of a person. They are doing what they can. To your points Leo, yeah they already cram their bedroom full of business stuff too. There's just so many different types of fur/patterns they need on hand that there's not nearly enough space for it all right now. They do keep things out of the kitchen at least, but there's no separate dining room in this apartment, so it can be hard to find a place to eat sometimes. I was surprised to see that when I got home last night, they had straightened up somewhat -- no prompting on my part. Funny how these things work.
They are confident that with a bigger place, they won't be spilling out into the living areas as much. They want to rent a house with a basement and then keep all work stuff confined to that basement. If they can pull that off, it should be okay. *shrug* It'll be a topic of discussion for the next few months, but for now I'm not as stressed about it, thankfully. Virtual hugs?