I stayed for 4 weeks in this apartment and would stay again.

Positives:
Location. There are three train stations for three different train lines each within 15 minutes walking distance from the apartment allowing easy access to the popular areas of Tokyo, and also easy access to Saitama, Tochigi etc. Convenience stores, supermarkets, restaurants are nearby.
The apartment is small by Western standards, but it's big enough for one person or a couple to be comfortable in. It has all your basic amenities, and the gas stove and wi-fi speed were great.
Negatives:
The kitchen floor was dirty and sticky when I arrived and seemingly had not been cleaned properly. The bathroom exhaust fan was extremely noisy, and the bathroom had no window so it took a couple days to dry fully after showering.
Points to be aware of:
The room is typical Japanese tatami style i.e. no chair, sofa. Also, there is a newspaper company directly opposite - they work after midnight and it gets a bit noisy then.