We should point out that we stayed in summer, so the chalet was self catered. There were 10 adults (4 couples and 2 singles) and we had plenty of room, although one couple were sharing with the 2 singles. We were all age 25 and looking for a base while doing various alpine activities for a week.
The chalet is enormous and very well planned out, allowing for amazing panoramic views of Morzine and the surrounding mountains. The balconies on each level are south facing and spacious, so you can relax with a drink and look down the valley. The bedrooms are plenty big enough with large en-suite bathrooms, including walk-in power showers (no feeble tap adjusting hoses here). Facilities in the chalet include sound system, wifi, table tennis, small pool table and a hot tub (although this isn't advertised in the summer). The chalet was immaculate throughout.
Our Treeline rep, Hannah, was very helpful and can be contacted to arrange your trips and any other things you need help with.
Morzine is great for sports - we went biking, canyoning, canoeing, swimming, tennis, football etc. and there are loads more such as paragliding and white-water rafting. Example prices: paragliding 90 euros; canyoning 50 euros. But if you buy a "multi-pass" (about 10 euros each for 6 days), you can get access to the tennis courts, basketball, football, and the big swimming pool which also has seperate kids pool and water slide.
Morzine nightlife in the summer was not great while we were there. The bars were half empty most of the time. Or they were full of blokes swapping stories about their "gnarly" rides on their bike that day. (If you are interested, the male to female ratio in bars was typically about 40 to 1....) We generally just had beers in the chalet. Prices for beers in bars are about 6 euros for a pint (basically standard alp resort prices).
The only downsides of the chalet were the number of chipped and battered cups and plates, the oven which was difficult to work, and the lack of quality cooking utensils.
We would visit the chalet again, but we would hire a car so we could travel around a bit, and it would also help with getting up the very steep hill from the town centre to the chalet!!