My husband and I stayed at Manami's place for 2 nights, and we had a positive experience. The location was relatively easy to find (more or less in between two stations, which was about a 6 minute walk). The apartment was equipped with all the amenities for a short stay, including a washer which was great since we ran out of clean clothing at the end of our Japan trip. There're also convenient stores nearby for any general things you need. Manami's instructions were easy to follow for any questions we had during the stay.

The location is near the train tracks, so if you're a light sleeper, you might need to block out the sound. My husband and I were so tired that it didn't affect us much.
The loft bed requires climbing up a ladder, so make sure you're comfortable with that.