Our stay at Nanako's house was fantastic! The location was great (nice grocery store just 2 to 3 min away), comfortable space, and good access.
Location: Although close to the big station Shinagawa, the neighborhood is very quaint and you feel very safe as we saw children, families, and elderly people. Away from all the crowded/busy/tourist-places. Also, close to the station. My daughter felt very safe walking home at 10PM from the station.
The House: New and comfortable! Nanako had the place spotless! We stayed here in November, but the house had really good insulation and that kept us really warm.
The Host: Nanako is the best host we ever had! Excellent communicator and she will answer any question you have right away. She is very considerate and gave a very detailed map of the location of the house.
We are definitely staying here again next time!
Note: The place is on the second floor with no elevator, so carrying our suitcase up and down was a little difficult, but it wasn't that steep so we didn't have too much of a problem with that.