From B21 round the corner by the strawberry crepé stand and look for the huge strawberry jutting out above the entrance. Once in the reception getting your keys and passcode are just as easy; the latter changes on a monthly basis, so you might want to keep that in mind for longer stays.
The A lockers are ~20% larger than those of C, but are also placed in the dorm itself so there might be noise. C lockers are instead placed between the womens' dorm and their bathroom.
The bathrooms have everything you'd expect from a dormitory.
Bring some cash if you intend to use the coin-washer/-dryer, as it's a 50/50 chance to get coins by card in the reception, dependent on who's working that day.
The lounge is very homely and cozy.
There are power sockets, but only up some very steep stairs if you need space to work on a laptop. A Bic Camera is a stone throw away for cheap USB-A&C charging stations.
There are no sockets or WiFi-coverage in the crawlspaces, but there are AC, making them prime relaxing spots.
No communal kitchen, so it's either microwave or boiled water when you don't want to have to find a spot at one of the multitude of over- and underground restaurants and food stalls in the area.
Cleaning seem to happen twice a day; around 10:00/15:00. The personnel turn on/off the dorm lights around 08:00/22:00.
Travelers keep it quiet in the dorms for the most part. Saw mostly fishermen and couples, with the occasional VIP-bus traveler, from France, Germany, and South America.