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Staying near Interlaken can mean evenings beside Lake Thun rather than in the town itself. The apartments here are around the lake, so the shore and nearby villages are part of the holiday. Interlaken and the Jungfrau Region are days out from that base.
The tradeoff is the journey. For repeated early activity meetings or late nights in town, central Interlaken may suit you better. Before booking, check a real journey from the apartment to the place you want to visit. The car-free travel guide explains what to look for.