Only real complaint I would have is that the building is in a somewhat sketchy area, but I never ran into anyone suspicious or anything. The curtains were closed the whole time, though, because we were on the first floor and the window faced directly into the street.
Check in and check out was simple, it was all done through the tablet at the front desk area and English was an option. We get a passcode instead of a key so that's one less problem to worry about.
The main room had a pretty good amount of space for laying your suitcases down to pack up. The shelf space on the main table and behind the beds were enough to hold things we would use throughout our stay (phone charging, change of clothes, skincare products, etc). The lights in the main room are also dimmable, something that helped in the mornings if someone was still asleep, but others want to get ready.
The best part about Eisei stay was how close it was to the nearest convenience store. At the end of our busy day, we could relax and buy a simple breakfast for the next day at the Family Mart right across the street. It also helped to make the place feel safer.
It's hard to find hotels that have 3 separate beds in a single room; it's an awkward number to have. To get exactly what we wanted along with all the other positives I mentioned before (and for a reasonable price), I really feel like we got lucky finding this place.