My husband and I recently stayed a few nights in a lovely studio apartment in Bonigen, Switzerland a few minutes from Interlaken.
It is connected by a separate entrance from the owner's home. She is a delightful hostess. You really can't find better.
Cindy Muhlemann (grew up in San Diego & married a Swiss gentleman by the name of Sam)
Located in Bonigen (350 feet from beautiful Lake Brienz)
Phone +41 794325454