With the seats down you can fit the bike with the front wheel attached, or two bikes with wheels taken off. I fit a deep freeze in mine and still had room for other stuff. My parents had a Golf when they lived in Germany and claim to have transported a washer AND dryer in it.
The amount of space in this car is immense considering the overall size. And the utility is awesome. Just the other day I was buying groceries, bring the cart up to my car and open the hatch and realize I left my golf clubs in back (leaving no room for groceries with the seats up. All I had to do was simply reach for the little handle on the back of the 40% portion of the 60/40 split rear seat (you can do this from the back, you don't have to crawl into the back seat and fiddle around with stuff), push it forward, rearrange my clubs so that they are pointing forward through the seat: presto, room for groceries.
As for passenger room, there's plenty. More rear leg room than my Jetta had by far, almost as much as my dad's Audi has.