This was the prettiest AirBnB I stayed at in all of Switzerland - love the view and the little table outside where you can sit and eat and take in the view - very well furnished and Hannes's parents were great hosts (his dad helped me shoo out a neighbor's cat that decided to jump through my window at bedtime). Fully furnished with pots and pans and cutlery if you want to cook, plus coffee/tea/drinks/etc provided. They have a big dog, Millie, who also tried to take up residence, but she's very friendly. I would absolutely stay here again.
One thing to note if you're relying on public transportation is that the bus connection from Interlaken can be a bit tricky - so if you're, say, heading into the Lauterbrunner valley (like I was), it can actually take longer than you expect to get back at night; I had to take the train from Interlaken to Thun and then a bus from Thun to Sigriswil, which took like an hour and a half in total (although I was coming back pretty late at night - connections are more frequent during the day, every ~30 mins). Nonetheless, great place to chill, and literally right next to the bus stop, so it was convenient and great value on the whole.