Yes mostly Brits. Its a very Brit resort but none of the Costa style 'fish n chips' shop feel.
More upmarket than the San Jamie complex down the hill. I've stayed at both and much prefer your hotel. The apartments around San Jamie can be noisey till late but the Valentin is peacefull. Its a little further back from the beach but well worth the extra few yards!
If you don't stray far from the hotel you will miss out on a lot. Grab a car if you can, see Cala Galdana its beautifull, mount Torro & Fornells.
I'm not sure when the festival St Joan is this year, if its on when your there I recommend you avoid it.
I'm out there myself a couple of weeks after you so don't hog all the sun.