I cannot recommend this place enough. The entrance to the nearest train station is less than one minute on foot. Also nearby are some of my favorite spots in Tokyo! Kappabashi is right around the corner. Ueno is a fifteen minute walk.
The space itself is cozy. The space is used extremely efficiently. There isn't a lot of floor space, though. If you're staying here with four people, be prepared to stack your luggage or something. As three people, we were able to use one of the beds for storage.
The beds are comfortable. The table has enough seating for four people with two optional folding chairs. The kitchen is fully equipped. I didn't use the washer, but it looks new. In fact, everything looks brand new. I think even the building is recent construction. The shower is awesome, but very small. The toilet room is also extremely small, but the toilet is one of the most fancy I've used.
I highly recommend this location!