We stayed 4 people, with my wife and 2 children who had grown up. Our experience is:
1.. Hikari is a good host and responsive answering our questions
2..Check-in and check-out is very easy
3. The location is very close to the bus stop that goes to Shinjuku Station (just across the road). at night we use taxis from Shinjuku Station to the apartment, it costs around 1600yen
4..Apartment is clean with facilities available for daily needs and for convenience, recommendations for 3 people (max. 4 people)
5..Potable wifi and washing machine available. can dry on the balcony
6..Minimarket like 7-eleven isn't around there
Apartment is recommended for guests who have lots of activities out