We were a group of eight family and friends in Switzerland for the Fête Des Vignerons and some local hiking, sights and dining. We had searched quite a lot to find a place with enough bedrooms (not just beds) AND bathrooms, plus dining and hanging out space. We found Chalet La Rosière about a year before our planned visit. The Chalet in summer was an excellent base camp for us. Contrary to another review we saw, the shared spaces were quite comfortable for all of us, and even some day visitors one day. We ate breakfast around the large table nearly every day, and enjoyed our apéro in the living area nearly every evening. We did light food preparation in the well appointed kitchen; the dishwasher got a daily workout!
The beds on the second floor ARE large for the two non-master bedrooms, but as spoiled Americans we mostly appreciated the comfort. There was plenty of built in closet space to store clothes, shoes, etc. and a couple of pieces of luggage in each as well. The third floor space is more quirky, with its various configurations of single beds, and three of our guests were very comfortably installed there. Note that all the second floor rooms and two of the third floor rooms have sinks and showers and there is only one toilet (in its own space) on the first and second floors; there are two on the third floor and one in the basement. This worked out fine for our group but it might mean if you are not in the master on the second floor you would go upstairs or downstairs for a toilet.
The town of Villars-sur-Ollon is delightful; very convenient to local randonnées and with good train and bus services; there is a télécabine up to Roc D’Orsay and a funicular up to Bretaye and down to Bex. A restaurant called Vieux Villars has (re) opened only steps from the Chalet; we ate there several times and both service and food were terrific. The local boulangerie is a five or six minute walk, and grocery shopping a short walk also. The
Back to the Chalet: it was super clean, with a lovely modernization that is tasteful and preserves the chalet feeling; the backyard could have used a mow but had a great table, many chairs and chaise lounges, and a very good charcoal grill. It was a hot week but we did enjoy some outdoor time there. Note that there is a lower space for stowing gear that would be very useful in winter.
Overall, a very happy experience.