Modern apartment with very comfortable beds. A fair size for Tokyo standards - just enough space for two adults and a toddler. Location was good, within 10 minutes walk of Shinjuku west exit (come out of Odakyu mall and walk straight through Memory Street and beyond). There is a supermarket (Marusho) around the corner along with a pharmacy, and a couple of convenience stores and cafes nearby. There is an elevator in the building so it was easy for us to get to the apartment with a stroller.
A few small issues we had: (1) the apartment was not very thoroughly cleaned. Most of the commonly used surfaces were fine, but the aircons and some parts of the kitchen including the shelves were quite dusty. (2) some supplies were not restocked, eg there was an empty jar of instant coffee and no garbage bag refills.
All in all, a very pleasant stay and would definitely recommend this apartment to small families or groups of no more than 3-4 adult travelers.