I've stayed in Innertkirchen quite a few times, in the middle of Susten Pass, Grimsel Pass, Engstlenalp and Grosse Scheidegg. So nice I stayed there 10 to 14 days at a time.
The hotels are pretty reasonable. The 'Bikers Hotel' (aka Hotel Restaurant Urweider I think, opposite Alpenrose hotel) used to have bunk rooms as well as cheap private rooms.
Alpenrose, and Hotel Alpina almost next door (all in the centre of the village) both have cheap-ish rooms.
Hotel Hof & Post is also a 'bikers' hotel, but more upmarket, more expensive than those above.
I always went 2nd and 3rd week of June which is right out of season but the passes had just opened, so prices are low season. And weather sunny most of the time.
If you
umm and
ahh a bit when they give you a price they usually come down (in June), but they're also great at recognising you from previous years so I usually got a discount.
There's also nice camping along the river behind the Alpenrose and Alpina hotels.
Anyone thinking this could be good for a bicycle stay, that was my transport when I used to stay there. Great cycling country

as well as motorcycling