Villa Jumbie was the last place we stayed on STJ, and we absolutely loved it.
How many people total in your party,4? I'd say just go for it.
Like so many folks on vaca down there, we tend to get up early for a big breakfast, coffee, bloody mary's, etc...so I don't think that there will be any type of crowding issue. Each bedroom had its own bathroom, and there's another on the patio by the pool, which was a treat,so you won't have to wake anyone if you need it. Since you're going to be with your kids, I'd recommend you take the sofa bed for obvious reasons... They'll love their own rooms, and you'll feel safer about "guarding" the sliding glass doors from any adventures they might want to take during the night-time hours. Having a.c. will undoubtedly divert any potential crankiness for all involved, as you're probably well aware. Also you can totally unwind how you wish after they're asleep...just sayin'...
Ok, enough of my opinions, hell, I don't even have kids, so who am I to tell you how to manage yours?!?
Truth told, the villa is plenty big enough,-much roomier than the pix show on the website. Awesomely sized open kitchen, and the deck is wonderful! Having washer/dryer is a definate plus, too. Plenty of floats, chairs, coolers, etc...for your beach trips. We actually brought down a ropeladder to use for a dinghy day that we donated to the owners & guests, have at it!
Then there's the location and view,- I'd give both a resounding 2 thumbs up!
We absolutely loved having the shops & restaurants at our fingertips. The home is clean, bright, and I just can't say enough good things about it, the owners, and management company, as well.
Sorry to say I've never been to Sea Glass, but thought I'd ramble a little about Villa Jumbie. LOVED it!
You'll have a blast either way.
Smiles-
MJ