This is a great place to stay if you are just looking for a place to sleep/rest as you are exploring the city! It’s super close to the Ueno JR station and a bunch of places to eat! The place is also pretty cute with great aesthetics of that matters to you. The ‘capsules’ were spacious enough to feel cozy and each one had a small fan set in to the walk to help circulate air which was a big plus.
The only downside was that for the listing I book with it implies that I would be in the 5th floor in a specific spot but when I arrived I was assigned differently. Normally it would be fine but instead of the implied bottom spot I wound up with a top spot. The ladder is off to the side so it can be a bit precarious climbing up. Still not too bad though!
Other than that everything was as expected. The nice thing though is that they will hold your luggage for you after you check out. It gets stashed in to another room and gets wire locked together.