Haruko was a kind host. She allowed us to check-out after the standard time as we had a flight at 22h. Haruko answered fast to all our messages and was very helpful.
The apartment is located near the Seibu Ikebukuro line (5 minutes walking from the apt), which ends at Ikebukuro (2 stops) where you can take the JR Yamanote line. It is tiny but enough to sleep, have a shower and even cook. The bed is big as compared to regular Japanese beds.