Beach Club Villas have their own building behind the main resort, nearer the road and parking lot. No great views from any rooms, although you can see the top of SE and some fireworks from some of the rooms although those would be near the road. Not noisy but mostly the view is trees. So your choice is basically a pool view (noisier), trees or the main resort.
But there is a short cut to the bus stops, past the villa pool. You can also take a path to Epcot rather than go through the lobby, but it isn’t particularly easy to find and not intuitive either! So no particular benefit either way. Other than the balconies. Some have large balconies, others are quite small.
Also the difference in sleeping numbers for a 2-bed depends on whether you have a dedicated or a lock-off.
A lock-off sleeps 9. It is a one bed linked to a studio, so the second bedroom is a studio, with a queen, a sofa bed and a pull-down kids bed, plus kitchenette and it’s own entrance. And you could lock the door between the one-bed and the studio for privacy if you wanted.
A room request via TP is still just one fax.
A dedicated has a proper second bedroom with two queens, no pull down. And it’s own bathroom obviously, but not it’s own entrance.
Now if you booked it on points, either your own or rented, you are allowed to have 9 in one, they don’t provide a bed or linens or even extra towels. It’s just because the one-bed only sleeps 4 vs a studio that sleeps 5 so they allow members to have that extra person. But ultimately it would be up to the owner if they are happy to have the extra person on. My guess is a private owner would be fine, but a broker would probably not be in case people didn’t understand and then complained about the “missing” bed.
For your situation, I would go for a lock-off, so DN can sleep in the pull down bed in the studio.
You will have a stacked washer and dryer, and a full kitchen, including a full size fridge with large freezer section, dishwasher, cooker, hob and microwave.