We spent 6 nights in June 2017 and I would highly recommend this place. The penthouse is a 4-5 minute easy walk to the train station and Co-Op. The kitchen was well stocked with place servings and cookware, coffee maker, toaster, dishwasher, etc. We ate several meals at the built-in round table in the kitchen, but there was also a large table and chairs in the living area as well. Everything is in great shape and very comfortable.
Our 3 daughters split up in different rooms, and our youngest was determined to sleep on one of the sofas up in the loft. The beds and linens were comfy.
There was plenty of space even if we had double the number of people.
We spent a lot of time out on the long deck with great views across the Lauterbrunnen Valley and up to the Jungfrau.
The windows are huge and let in lots of light. They also open several ways to let in the cool mountain air. We kept them open most of the time. My only complaint at all is that the last 2 nights of our stay someone rented a lower unit and smoked continually on the deck right below the master bedroom. We sadly had to keep closing the windows because of the smell.
Wengen is quieter than Lauterbrunnen or Grindelwald. There are fewer shops and restaurants, but we loved the small (mostly) car-free town. It was wonderfully quiet and relaxing.
A few notes on Wengen:
The Co-Op closes at 18:30, but a smaller grocery up the street is open till 21:30.
If you are counting on gondolas to travel across valleys, make sure you know the time of the last trip each day.
The Oberland Regional travel pass is a good option if you plan to explore multiple places. It is a little pricey up front, but it was cheaper in the long run and you could always just hop on train without worrying about buying tickets.
The little bakery in town has awesome bread and pastries!
Da Sina was a nice place to grab pizza and beers on the patio.
We enjoyed the fondue more than the raclette, but the rosti was good everywhere.
Try the Ramseier Suure Moscht fermented apple cider.