Service is questionable plus crazy service charges - BEWARE!
I just stayed 10 nights at the W Union Square and u can't beat it for location. The restaurants nearby are fantastic and open till late and the proximity to convenience stores and shops are just a stone's throw away. BUT and there are a few BUTS, the service standard of the rooms are quite questionable. I asked for my rather dusty room ( the side lamps in the bedroom revealed a headboard that had only been cleaned to hand level - above that, you could clearly see a thick film of dust!) to be cleaned 4 TIMES, but to no avail - and despite specifically telling each front desk staff what needed to be cleaned, it took a turn-down service staff to be led, by hand, to what was the lovely dusty headboard, a shocked expression from her, and finally, a clean room after my 8th night there! 
The other thing which is highly wrong are the charges they levy on packages sent or picked up from the hotel. As I had a few packages picked up and sent from my room, the hotel charged me for each and every pick up and drop off ( and I mean just at concierge) for a cost of $10 each time with taxes. And that's on top of my tips and gratuities - I found this shocking and when questioned, the arched eye-brow front manager told me sarcastically that I had already enjoyed quite a few "free" deliveries and that it was stated in their website that they charged for such services! This is the FIRST time I have ever been charged for such things - and I was not at all impressed. I will be taking this up with their management and really, this should not be the case of a top rated hotel like that - SHOCKING! 
My bill ended up over $200 more due to this service that they charged ( I had to pay for 3 rooms) and I am still reeling for this "charged service"..
And this they call their world famous whenever whatever - it should be called whenever, whatever, pay now, question later! Won't be a repeat visit for sure...