7 nights in Murren, OR 5 nights in Murren and 2 in Bern

Murren is a small town and a little difficult to get to (cable car and train from Lauterbrunnen). I suggest spending your nights in Lauterbrunnen instead. Much easier to move around to both sides of the valley from there, as well as the very pleasant walk up the valley.

Regarding Bern: It is about 1 ½ hours from Wengen, so not necessary to stay in Bern. I know you plan to stay in Mürren, which is my favorite town in the area, but I think trails from Wengen are easier to access (We stayed in Mürren 5 nights and 2 nights in Wengen in 2021). On a rainy day in Wengen, we took the train to Bern for the day.
Last year (2022) we stayed in Wengen 7 nights to access trails near Wengen and Mürren, as well as First (Grindelwald), and Schynige Platte. We purchased the Berner Overland Pass which allowed us free access to all those trailheads. It was great be in one location for that length of time.

Mürren is one of those places you never want to leave, and if you like to hike, you will not run out of things to do. I would day trip to Bern.

Since you picked the best place to stay in the Berner Oberland. I would spend all your nights there and daytrip to Bern. Bern’s Old Town is small, walkable from the train station and in three hours or so, you can cover Bern and return to Murren (Muerren) without moving headquarters. For great deals on holiday apartments rented out directly by their owners check out Muerren’s tourist office online bulletin board @ www.Muerren.ch. Some of these are cabins that work out to $100 per night for a week ($700) which is a screaming deal for the Swiss Alps. Click the horizontal bars in the top right of the first page. There is a selection for English but the website defaults to German so in just in case you can’t find the British Union Jack 🇬🇧 for English, on the next page click “Essen & Ubernachten” ( Dining and Overnighting”). Then click “Ferienwohnungen” (holiday apartments). You enter the town you want ( Muerren, Wengen, Grindelwald, Lauterbrunnen etc ). the dates you need accommodations, the number of nights you want and the number of travelers. All the available holiday apartments and cabins, along with pricing ,will appear on the screen in seconds!

Have a great trip!

If you're flying out of Zurich,( mid morning or later), you could go to Bern the day before, and commute to the airport from Bern. Just an idea....

There are a lot more variety of places to eat at night and entertainment in Bern than Murren. You should try it for a change of pace. I have been to Murren 3 times; it is a place to return to again. I stayed in Bern 3 nights my last trip and day tripped to the mountains.

Everyone will have a different opinion based on personal preference. My husband & I spend 6 weeks in Murren every summer and still haven't gotten sick of it. So that kind of answers your question :)