I loved staying at the apartment.
We were 4 guys living there for a week, but the accomodation was large enough for us to have the space we needed.
The washing mashine, and the shower which could be used as a "drying room" was fantastic. Everything worked, and Masami gave us very good instructions on how to use everything.
A bonus was that there actually was a japanese USB hub available, so we could charge our cellphones without having to buy another USB hub.
All in all a perfect place for us.