We stayed at Chalet Brunner 2 in early June 2017. We had two adult couples and two college-aged children. The apartment was perfect. There were 2.5 bathrooms and we had no issues with hot water, even taking back-to-back showers. It was really nice (compared to some other places we have stayed) to have such bathroom space.
The overall apartment was large with a big common living area and kitchen in addition to the three bedrooms. We used the outside porch for several meals and enjoyed the view. We watched a movie one evening, choosing one from the nice supply of DVD's that Paul had stocked at the Chalet. Internet access was reliable and fast.
We were on a multi-stop trip and did several loads of laundry using the washer/dryer. As far as we could tell, these were shared for the chalet and located in the basement, but easy access, clean and convenient. The machines were always available when we wanted them.
We had never been to Wengen before and didn't do much research so didn't really know what to expect. We loved it and would definitely go back. As those of you who are better informed know, the village is not lacking in any convenience and has many restaurants, bars, souvenir shops, etc. Wengen is not a roughing-it experience, but a luxury one.
One warning to those that are cost-sensitive (as I am) is that all the restaurants are expensive. The saving thing for me was the grocery store called the "coop". Food costs were not that different than in large cities and we ended up buying food and cooking at the Chalet for all of our meals. The Chalet kitchen was well equiped and capable of all our needs.
Before going, I was worried about the "650 meters" from the train station to the Chalet - as an American I kept trying to convert it to miles and wondered if it would be a mountain-climb to reach the Chalet. Turns out it was no problem. Smooth paved road all the way, we rolled our carry-on luggage smoothly. The distance (though uphill a bit) was no problem and we are not in shape. We had no hesitation to go from the Chalet to the village center and back several times per day.
We mainly hiked, doing the cable car up to Mannichen then the trail to Kleine-Scheidegg (downhill all the way) and train back to Wengen. Beautiful hike! We were only in Switzerland for a few days, so I didn;t buy the half-price train card, so each ticket I bought was expensive. Be careful to do the math on each ride you want to take to see if you need one.