Great place. Plenty of space for a Tokyo apartment. Great, great, great location on a lovely side street in lovely Meguru. A short and nice walk to the train and to restaurants and anything else you could want.
The place does have an odd layout even for a Tokyo apartment. It looks like it was once two offices that were combined into a single residence, which would explain the three total bathrooms (two of which are labeled "men" and "women"). There are only really whole living areas where people can sleep (upstairs and downstairs) so while there is room for plenty of people to sleep on the floor on futons, note that there is no privacy within each area.
For ultra-light sleepers like me I would point out that the walls are thin so you can hear outside noise. Even though this is a very, very quiet neighborhood, I did get woken up by the brief surge of traffic each weekday at 6AM. My kids are normal sleepers and did not even notice.