really depends on how much time you're going to spend in the room
together.
if you're going to be out most of the day, & just sleeping there, the studio will be fine IMHO.
if you're going to spend hours lounging in the room, the tension might build.
just think: many families stay in a regular resort room without any counseling needed

~ it just might feel a little more crowded as everyone is accustomed to the space of a 1 bdrm. your 13yo DD is prob going to feel the "space" issues the most (teens tend to need a little more breathing room), so i would just encourage her to do a little on her own: hang out at community hall, go for a swim..it'll give her the time she needs, & she'll prob love that little bit of freedom.
we've only stayed in studios as 2 ppl, but find the kitchenette more than sufficent for b'fast & snacks (all we really need is the coffee-maker; the toaster, microwave & mini-fridge are just nice bonuses

).
the laundry room is convenient ~ DH norm just does 2 loads of laundry late at night when they are empty, & we hang out by the pool (BWV) until it's done.
i think you'll be fine
