We were a family of 4 travelling to Interlaken. I found this hotel online and all I can say is that it was the highlight of our trip. It was a very homely hotel, with comfortable rooms and extremely extremely good staff.
The location is superb. It's about a 4-5 min walk away from the main street (where hotel Victoria is located) but on looks the river and you have an amazing view from your room which very few 4 star hotels have!
We stayed in the family room, not too sure if they gave us the family room though however they gave us rooms 103 and 104 which were adjoining as turned out to be really good for us 4. Quite spacious and comfortable! a note though, there was no air conditioning so we had to sleep with the windows open
The reception Viola was very sweet and even bandaged me up after I fell riding a cycle at interlaken! They help you with every little detail and this really made our stay in Interlaken memorable.
We stayed in many hotels right from Intercontinental in Rome to sorell in Zurich however none felt as nice. They gave free Wifi, breakfast, bikes that you could ride, and even city travel cards for public transport.
In short, unless you're looking at something like Hotel Victoria with the rich snooty crowd, Bellevue would be a fantastic decision!