stayed here for a week in june and found it reasonably good value, albeit with some quite major cons.
but first, the pros:
• the location — honestly great, it's a 5 minutes' walk from coex/airport bus stop. the nearest train station is a little further away, maybe 10-15 minutes, but i didn't find it a hassle. there's a gs25 right around the corner and some nice diners.
• the hostel is new and quite beautifully decorated. i found the capsule to be quite clean and conveniently outfitted, and wifi was great too.
• staff were all friendly and helpful.
cons:
• i booked the capsule suite because i wanted the desk for work purposes. the fact that the rooms are inaccessible for "cleaning" from 11am-4pm is a pretty major con in my opinion, especially since there isn't even daily housekeeping. i don't see why i couldn't have stayed in there during the time.
• there are only curtains, not doors, which means you can hear pretty much everything — luggage being zipped, the main door being opened etc. they do provide earplugs which i was very thankful for.
• the fixtures in the showers weren't very good quality. a few times i entered and the tap handles were missing etc. think this needs major work. bath mats would be great as well.
all in all, i think the hostel is a nice basic option for a night or two. but some improvements would elevate the experience significantly!