The property was very clean – the lobby area, locker room, shower room, capsules, etc. all felt thoroughly cleaned and prepared, which is very appreciated, especially when it comes to shared spaces.
It is definitely somewhere you can show up to with minimal luggage, as they provide towels, toothbrush, shampoo/conditioner/soap, slippers, lounge clothes/pyjamas, etc.
On the other hand, it may be slightly less convenient if you have a lot of luggage, as the lockers are quite narrow and a small luggage would not fit in there. A backpack likely would.
However, there is a separately luggage room for you to store any luggage or oversized bags – this is not locked/monitored, but everyone who goes past the front desk needs to be a paying guest, and Japan itself is quite safe overall in terms of property, and I was never concerned.
The locker room itself also does has some larger space in the back for you to open up your luggage and grab stuff temporarily before putting it away.
If you are a light sleeper though, or easily affected by other people's noise, this may not be the place for you. Personally, the person in the capsule next to me was talking on the phone well into the night, and they may have thought they were being quiet, the "walls" of the capsules are very thin, and you can very easily hear every noise from people coming through and definitely from the people next to you.