So what I think is happening is he is trying to tell you that he is now the boss and going to dominate the living room and is willing to fight you for it.
One reason bunnies pee on the couch is because that is where :"our scent" is, and a dominant bunny will try to scent over yours. (Another reason bunnies also do this is to say they are part of group, but because he tried to bite and become aggressive, I am thinking he is just trying to dominate)
So here is my suggestion. Do not allow him in the lounge for 2 weeks. Is there a way you can block him out? Like a pen or ?? I know it will be a pain for you. But I can't imagine it would be more of pain then a peed on couch and rug and a domineering bunny.
Then after the 2 weeks, he's only allowed in the lounge for short spurts with close supervision,(even if he does well, don't let him get too comfortable and settle back in his old way - so 15 minutes or so and slowly increase time) \
As soon as he jumps on the couch, you get him off. Don't even allow him up there at all for now. Wear thick gloves, so that if he lunges and bites, you won't pull away, and you won't be affected. He will learn that lunging and biting will have zero affect.
Don't scream or yell, just firmly say no or clap, and gently and quickly push him off.
My Bailey used to be a very stubborn marker, but this method really helped, plus, I found that if I lay on the ground with her and rub my hands and feet all over the rug to get my scent on it, she began to get the message. But she only got the message once I established I was boss and that my scent meant she couldn't mark there.
Also during the 2 week period try to get your bunny's scent out the best you can. I know a 50/50 vinegar and water mix can work well, and there are some products out there that you leave in and when they dry the scent dissipates. (of course you have to make sure they won't stain your stuff.
With Bailey it took about a month as she is either stubborn or dense. (I'm thinking stubborn!) With the other two, in the very beginning they tried the couch thing, but after training them not to go up on the couch, they rarely go up there even when I'm not sitting there. When they do, they play and act like they are doing something naughty like jumping on the bed, but they don't mark. I can't remember how long it took them, but if I remember right, it was less than two weeks.