I don't like playfighting, verbally or physically, and I rather not witness it; and I would certainly not want it in my house.
BUT I would never dream of asking a couple to come live in my house if I didn't know them well enough to know whether their habits were compatible with what I do and do not want to see. And I would *certainly* not pull a bait-and-switch on someone, like that couple did to you, asking them to come share my house and then only offering them a bedroom with no privacy!
Who does that? How in the world did they think that was going to work out?
Heck, even with a completely "compatible" couple I would not imagine that would work out, giving them no privacy at all! Not even with a /single/ person, I think... Everyone needs a bit of privacy once in a while!
Edited to add: so I think that this couple was more in the wrong than you, and I also think they could have worded their reasons for no longer wanting you to live with them more tactfully.
Also, just like some other posters have said, I think they could have spoken to you about the issue first to ask whether you were willing to tone it down.