I stayed with my family in a Cabana Bay suite in May of 2015, My parents (40s), my grandmother and family friend (60's), My self (20s) and My brother (Teens). We are all about average sized (my dad being a bit above average) but we tend to pack a lot of stuff (well my mom does) and after or universal stay we were going on a 7 day cruise so we had even more stuff! Even with all our luggage and souvenirs there was plenty of room. Another thing I remember is the safe was quite large, we fit four full sized ipads, a MacBook, and two ipad minis in it and we could have fit one or two more things! We all slept comfortably 2 in each bed and 2 on the couch pull out. There isn't a door to divide the bedroom area from the living room (its more like a half wall with the kitchenette on the other side) my dad tends to be a snorer and we still heard him in the bedroom it was very little. My parents said they slept very well on the pullout couch that it was "good and thick" or not a thin mattress like some pull outs tend to be. I thought the beds were soft and cozy. The bathroom was larger and had a large counter area around the sink. Enough to fit the makeup and hair products of four women! haha As for the kitchentte we didn't use it much because we mostly because we ate at the parks but any leftovers we took back for snack stayed good in the fridge and the microwave works just like a microwave should.
We loved the pool! The water was nice and warm and it was huge! Although we swam mostly after dark, there were around 15-20 people in the pool too, but because of this size it felt like we had it too our selves. Galaxy Bowl was awesome! The nachos were the best!
Our buses from Cabana Bay to the Universal Parks were always clean! We never waited for then five minutes for a bus, and the drive on the bus is only about a mile so it didn't take us very long. The buses drop you off right up front near bag checks. We drove though some parking areas and I have parked at universal before, and if you take a car you'll pay for parking (I think 18-20 dollars, but I could be wrong about that) in a garage and then could walk a ways to the park (depending on where you get placed)
Cabana Bays overnight parking is like $12 (I think) I'm planning a trip now for September and that what my TA told me
Cabana Bay does NOT offer express passes with your stay, so if you would want those again you'd have to buy them unfortunately
As for Disney busses it been about 5 years since I'm not as recently versed in Disney. Sorry