i have never had so much space to myself in a hostel/capsule hotel before. the bunk was narrow, but you get so many shelves; a rod, hook, and hangers to hang stuff; and plenty of room for your suitcase(s). this alone made it one of the best stays i've ever booked.
this is a traditional wooden structure, which may not be for everyone but i loved the vibes so much. please respect the tatami flooring and bring socks, or be prepared to go barefoot. i went during a rainy season, so it was mildly humid even inside even with the ac on. also, sound /does/ travel. every creak of floorboard or bedboard, the murmur of outside conversations, etc, were audible. bring earplugs if you think that would bother you.
it's a ~20min walk to the kyoto shinkansen station (doable even with large suitcases as long as you stick to the main roads, which have sidewalks), but there's a closer subway stop ~10min walk away if you have more to carry. the neighbourhood is liberally serviced by multiple bus routes (helpful during your stay!), but the bus system discourages bringing large luggage or large amounts of luggage on board.