Very nice place to stay at in my opinion. Only few minutes walk from stations, and nearby convenience stores if needed. Amenities and room are practically always clean, and the staff are very nice. I found the bed and comforter quite comfortable too. Honestly would recommend this place as home base since it's all for a good price too!
Side notes for those who do plan to stay here:
There's two usb ports and two plugs in the capsule (no ground prong) so you should be able to charge at least 4 devices overnight (battery, phone, pocket wifi, +1) which is nice.
Tissues by the bathroom sinks feel very thin like they'll break apart easily when drying your hands, but if you're gentle they get the job done well. Also, they're surprisingly good for cleaning glasses. If done right they don't leave any smudges for crystal clear frames.
The washing machine is a decent size to do a little laundry (weeks worth? I wear my jeans and outer layers a couple times before washing, but everything else only once). The dryer however takes forever, so I would actually suggest taking a walk to a Coin Laundromat if needed.
Some people have stinky feet, and at the Genkan (entryway) at each floor there's a shared shoe cabinet. Didn't get hit till I opened the cabinet (so no need to worry about room smell) but I didn't really want my shoes absorbing that stuff so I put my shoes in a plastic bag before putting them in the cabinet. (can buy bags for cheap at convenience store. Bags can be used for laundry bag too)
Although this may sound strange, I would suggest taking a shower before going to bed, not just after waking up. Japanese people normally do that, and you'll wake up feeling more refreshed. Also it'll make the rooms smell more fresh. Please. For other tennants too.
If you stand your luggages up on their wheels instead of laying them down when you're not using them, there'll be more room for people to put / open their luggages
There's switches for the light and fan for each toilet, each with an LED indicator. Green means light is off. Red means fan is on. If you had a business meeting, please leave the red light on after you close the door. I got hit by surprise a couple times when opening the toilet doors.
That's all! Otherwise everthing is perfect in my opinion. I hope you enjoy your stay!