Yeah it's really easy and it's a lot nicer for the bunny having company rather than being stuck outside. They're pretty sociable really.
Arfur definitely wees in the right place, he does leave a little trail of messages when he's out though (excitement I guess!). The good thing is that they are dry and you just pick them up. Our previous bunny, Stew, was really good and didn't poo outside his cage. He had a litter tray in his cage that we could empty.
You might remember one of my earlier posts a few months ago with the vet saying Arfur had behavioural problems (whatever!). We have never quite been able to sort him out with a litter tray, he tends to just wee at one end of his cage, but we just clear out any wet stuff in the morning when we feed him and he's fine.
He is very, very cute but if the worst happened, I wouldn't necessarily get another bunny until the babies are a bit older.