We're going to Snowfocus imminently, can let you know afterwards if you like? They run the ski school in house and have their own nannies as well, so Dd2 will be in creche while we ski - for a couple of days at least. From what Sue (who runs it) has said, Dd1 who is 4 will have an instructor to herself as the other children there next week are either smaller and thus not skiing, or older and out all day. I'm hugely excited! Just google Snowfocus and they're the first result.
Second Snowfocus, our kids are older now and can ski with us so we tend to self cater, but when they were younger we were SF regulars. They will tailor the week to suit your children - so they can ski on in the afternoon if they are interested, or have a tobogganing session, or hang out in the warm - and of course before they are ready to ski just get brilliantly looked after during the day, meaning you get a full days ski-ing yourself.
We have always had good food and company there too - less hit and miss than other catered chalets we have done. They do get booked up for school holidays quickly tho.
Things they could influence were brilliant - lovely nannies, good ski instructor for dd1, great food, comfy rooms, handy to have a bus to get about on the days when we didn't want to ski all day. Good ski guiding - always an easy group and a hardcore group depending on your mood. AT and Sue were very entertaining hosts in the evening, and helped oil the wheels between people who'd not met before.
Things they couldn't influence were also mostly fab - we had blue skies every single day, pistes were quiet (especially n the Swiss side of the resort) as the school holidays were mostly over, snow had been amazing up til now so pistes in great condition. Also lovely fellow guests They're n a beautiful location, the village is very charming and there's a ski bus stop at the end of the drive if you want to potter into town on a day off.
Only down sides; dd1 didn't have a little ski buddy so found the class a bit intense and tired easily. Also the location of the ski nursery was in the shade first thing so very cold, perhaps if they'd gone out a bit later it would have been warmer. It was a bit of a pain being tied to the group if you wanted to ski at different times/places - eg knocking off early. Usually there was someone around to do a pick up but could be a bit of a faff, less easy than ski-in-ski-out. But the rest of the pluses definitely made up for that.
One of the families we were there with were on their 6th year back, which is pretty impressive, and they're booked up for half term weeks up to 2015.