My concern about entering Epcot through IG was the walk to Future World. This will be our first trip without a stroller, so I'm worried about exhuasting the kids before the day even begins.
Really, the walk isn't all that bad. If you arrive at Epcot by bus, you have a fairly long walk as well.
I've stayed at OKW, and while I know that many people love it there, it is way down on my list. I hated dodging cars as I tried to get around. People just didn't seem to watch where they were driving. I found our studio to be a bit musty and drab. And the bus ride home, after a long day, was miserable. Our villa happened to be close to the main bldg...and we were the last stop on the bus. I think we spent as much time driving around OKW, making stops, as we did between Epcot and OKW!!!
I really don't think bedding or space is an issue with a two bedroom at BWV. Sure, you have to use a sleep sofa, but as I said before, I haven't yet had anyone complain about sleeping on them..my dh sleeps on one every time we go to WDW!!! And he has a bad back and has not had an issue.
As far as noise at night at BWV?? Not an issue. I've had villas on the 2nd floor...and wasn't bothered by any noise. When I was on the 4th floor, the only thing that was loud was the dinging of the basketball game bell...right across from my balcony. But that stopped every night at 10:30-11. And if the doors were closed, and the drapes pulled, it was barely noticeable.
I have had an issue once with late night Jellyrolls people leaving the area....obviously had had too much to drink..but they moved along quickly.
You may want to split up your stay...I would suggest staying at OKW for part and BWV for the rest.