Any suggestions for reasonable hotels in Interlaken?
Usual question, what is “reasonable” to you? We all have different perspectives of that term. How many people and what other criteria do you have?
When in doubt, use booking.com to see prices, features, location.
Consider to be near either Interlaken Ost or West train stations or at least a bus stop for less transit time. I too would start with a travel site like Bookings. YouTube is another information source to verify your lodging options you can view. In 2022 I stayed at Sabine's Place on Niesenstrasse (apartment rental).
What did you think of Rick's suggestions (hint hint)?
We stayed in Hotel Interlaken in 2019. The prices are steep to some, reasonable to others, but I can attest to the fact the hotel is clean, historic, and a quick walk to the Ost train station. Breakfast was included then. I had actually booked this hotel again for our trip coming up next week but decided to base ourselves in Lucerne as we are taking the Gottherd Express to Italy.