Before going to Kumamoto, we thought that this apartment was a bit costly, but since there was no other place to stay, we booked this one. BUT! After we got into the apartment, we found that it really worths the price.
The room itself is very clean and tidy. Futon sets and towel sets are well prepared. AC worked well too. The apartment locates literally above the JR suizenji station. It's also pretty close to the city train Shin-suizenji station, about seven minutes by walk.
From Shin-suizenji station, it's less than ten minutes to the Kumamoto city center and the Kumamoto Castle. For the Japanese Garden Jojyu-en, it's about fifteen minutes by walk. The apartment is right next to a grocery store with a little bakery, which is very convenient. Even this apartment is right above the JR station, it's very quiet and you can barely hear any sound of train passing by.
The only thing should be aware of is that there's no wireless (at least there wasn't when we were there). However it doesn't bother me that much since I don't need Internet for my tablets.
Oh also, Tomomi's parents are very nice people and we really appreciated there patience while helping us checking in and out.
I definitely recommend this place!