Don't bother - they don't seem to care
It started with the arrival. After a long transatlantic flight you would hope that your room is ready by 2pm. Clearly it was not, which happens but the real disappointment was the incompetent approach to managing this situation. All the girl behind the reception offered was to take my mobile number and give me a call when the room was ready, but she wouldn't say if this was going to be 15min or 2 hours! They only offered to store our luggage after we suggested it and it was put onto a luggage trolley and left in lobby until I insisted a couple of times for it to be removed to a safe area. Never were we offered a drink or a table at the bare or any other form of courtesy and they effectively showed us the door by suggesting that the neighbourhood offered nice walks. 
The room could not make up for the poor experience we had upon arrival, actually it amplified our dissatisfaction. It is not the small size of the room or the lack of natural light that threw me - I have been in NYC hotels before after all. It was the shabby, stained furniture, with marks all over them, the lack artificial light, that really surprised me (I am a regular traveller and stay in hotels 1-2 nights a week), as it did not even reach 4-star level in my view. Further, I am the only guy in the world travelling with appliances such as mobile phones, tablets and PCs? The room did not have a spare socket, other than in the bathroom. So I had to choose whether I wanted to use the lamp on the desk or the charge my phone and camera and I found myself moving furniture and tracing cables and leads to their origin. The worst however was the noise coming from the AC - if you want to cool your room it is like a 747 is landing in the room. I don't believe that I have ever experienced so much ambient noise in any hotel I have ever stayed in.
There are also a number of small details, which to me demonstrate that the hotel staff does not seem to care. Such as blinds which do no longer role down, a king bed-room where there is only one bathrobe in the bathroom etc.
On saturday morning we where up early, clearly jet-lagged and kept awake by the AC, which we never managed to turn-off completely, and we arrived at the restaurant at 7.20am, to find out that the 5-star Gramercy Hotel does not provide for guests before 7.30am. I hoped that the staff, who seemed to have the restaurant ready, would be able to let us sit already and have a cup of coffee, but they turned us away - we were clearly an inconvenience for them.
And did I mention that the roof terrace was closed for renovation during our stay? Clearly nobody bothered to tell us during the reservation nor during check-in. We were really glad to leave on Monday morning and at the check-in the girl did not even ask if I had enjoyed the stay - clearly they don't care.
Do yourself a favour and send you money with people who do.