K's has the option of either Japanese-style futon dorms, capsules or bunks, along with neat tatami doubles. There's indoor and outdoor onsen, a shared kitchen, a lounge and a terrace with mountain views. It's a 15-minute slog uphill from Hakone-Yumoto Station on the south side of the Sukumo-gawa, or a ¥230 bus ride.
Friendly staff are clued up on all the Hakone travel questions you're wondering about.