From what I've seen, bunnies can be difficult to potty train till they are neutered/spayed. first they are young and babies aren't so good, then they become adults and hormones tell them to mark.
That said, our kitchen is good sized and i am only finding a few pellets outside the litter box. Pee has been 100% for the last several days.
If she is allowed out however she wants on my bed and she will potty on it. so she will probably have just the kitchen till she is old enough to be spayed and then we'll start expanding her area slowly.
Right now I'm trying to convince her my glasses need to be on my face. For some reason they offend her and she rips em off my face at every chance and throws them behind her.