We enjoyed our stay very much. The apartment was located about 10 minutes to busy areas of Shinjuku and the subway to other popular areas of Tokyo. We were given the option to drop off our luggage before check in time (note that this is at the reception located a couple small blocks away at a small office titled NY Village) and ended up being able to check in early. The place was clean and as pictured. The front of the building is not the most picturesque, but we didn't mind.
Note that there is a binder with some information about the apartment (washer/dryer and water temperature) and surrounding attractions located under the TV stand. We were not informed about this and found this on the last day.