Keiko's apartment is a really nice, clean, quiet place. It is not in the middle of a busy tourist area. For some, that may be good because it means it is more quiet. For others, they may prefer to be right in the middle of the crowds and action.
There is plenty of space in the apartment. We had a family of 4 and never had any issues with the space. It was very clean, had all the amenities, and Keiko had lots of nice, small touches throughout the apartment. Keiko was also very helpful with a guidebook and also suggestions along the way to make our trip more enjoyable.
All in all, we recommend Keiko's place and she is a super host.