We stayed for a week, 5 adults.
Awesome apartment, close to the subway, which is an express to Times Square. Don't be put off by 127th street, it's as close to central New York as others, however without the hustle and bustle of down town New York. Really nice clean apartment, and Grover was very communicative, which made our stay some much easier.
Only comment I would make and it's nothing to do with the apartment, give Sylvia's a miss, it's an over rated restaurant just around the corner, KFC is better and I don't like a KFC :-)
All in all a great place to stay, and I would definitely stay again and recommend.
If you do, I hope you enjoy as we did!