We have been to Muerren a number of times but have not stayed in any of the hotels mentioned; we stay either in an apartment or at Chalet Fontana (Bed and Breakfast; very friendly but no views and no private bath unless you book the ground floor apartment.)
However, I do have an opinion about location: between the Alpenruh and Hotel Jungfrau, I would prefer the latter for location. It is higher up in the village, much better for views (I know the Mountain View’s are great from here as our last apartment was right across a little open space from it). The Alpenruh is lower down and does not get the same views or as much light. Also, as it is adjacent to the cablecar station, there are always people coming and going. Jungfrau location is quieter.
However, Hotel Jungfrau seems a bit old and dreary to me. Friends who stayed there one night last August said it was “OK” but not great. I suggest you look at the nearby Hotel Bellevue, which is also high up and offers great views. They are highly rated on Tripadvisor (yes, I am aware of the problems with Tripadvisor reviews, but I am good at filtering and I believe the reviews of this hotel, as well as most in Muerren, are genuine). I do know their restaurant is good, as we dine there when we want a restaurant meal in Muerren. We always get a friendly welcome and I have noticed their attention to detail. It would be my personal choice in Muerren.
If you want something closer to the train station, and are not as concerned with the view, then try Hotel Eiger or Alpina. The latter is right on the edge of the cliff so does have dramatic views down into the valley, but I do not find the alpine views from there as appealing as they are farther into the village and higher up.