Really not good
First I should start with I travel to NYC 12 to 20 times per year and am familiar with many of the hotels. I have stayed in over 10 hotels there this year alone and without a doubt the Bentley was the worst. Having said that let me share the good first. Their staff is very friendly and helpful. Unfortunately the hotel itself was not at all good. They suffer from some misbelief that they should turn off your electricity when you are out of the room and raise the blinds so even this week when it was cool outside it was hard to get the room cool (under 75). That was exacerbated by the lousy air conditioner as well. On top of that he hotel is very poorly located for most NYC travelers and it requires a lot just to get to the more popular areas for business or touring. To top it off they had my bill completely wrong (overcharged my by $46 plus taxes per night) which they did fix but it took a while. If I had not asked for a room under my door (that is not their ordinary practice) I would have been checking out before I found this and it took over 10 minutes to fix.
In summary I would recommend staying almost anywhere else in Manhattan until they get the HVAC and electricity fixed unless you just need to be under the 59th street bridge.