The place is clean and cute. It is similar to a one-room apartment in Tokyo. For one person is fine, for two is too small. Nonetheless, it has everything you need (but the microwave is outside, common share).
The best is its location, near the Soubu sen (central line), so it is possible to go to Akihabara in 10 min (where you can change to Yamanote) and to Shinjuku in 30 min. However, it is a pity that the kitchen cannot be used and there are not enough cleaning supplies. Apart from that, the apartment is a bit difficult to find and the check-in may be complicated.
To sum up, a great place! It has some flaws, but in general it is fine. Ah, and last but not least, the host is very very kind, she will take care of everything. Do not hesitate to contact her.