The hotel is very affordable and decent for shorts stays as expected for a capsule hotel, me and my partner had no problems sleeping, the staff is very helpful and is quite easy to get to the airport.
Some downsides are the distance from public transport, which can be a problem if you are traveling you hand luggage, and the neighborhood is a bit beaten up, but I haven't felt unsafe.
The other issue was with the bathroom, where the shower is not well maintained so the water stream went all over the bathroom, which might get your towel or clothes wet.