In short, this is a wonderful property, the chalet is 100% true to the pictures and frankly even better and Julie was as good as it gets in terms of making the process go smoothly, answering all questions exceedingly quickly and her flexibility and willingness to help can't be ranked highly enough.
A very personal experience that transpired during our stay does make me feel the need to just point out to future renters that Wengen is a car free village, thus your are completely dependent on the public transport hours and there will be times (very off-peak hours such as late at night) that you are literally unable to get down to your car if parked below in Lauterbrunnen, or just out of the village at all. This will not be a problem for 99% of visitors, and the car free element certainly adds to Wengen's charm. However, in our case we did just find ourselves in a very unfortunate situation where we were a bit desperate to get down to Interlaken below and were unable to do so. It is just something to consider in regard to traveling with either people or pets with any potentially serious health issues. There is a GP in the village that operates pretty standard hours, but no advanced medical care and there are no veterinarian facilities in Wengen. Even with our experience, I think the pros of Wengen still outweigh these cons, but it is something that certain people will want to really consider.
Otherwise, the chalet is extremely well placed, a local taxi will easily get your luggage up and down the hill for you and it's hard to imagine a nicer village atmosphere.