Enjoyed our stay....
I cannot speak for anyone else's review on Park 79 Hotel, BUT I will be more than happy to tell you we certainly enjoyed our stay at Park 79 Hotel. 
We chose this hotel based on the TripAdvisor discount. So glad we did. My husband and I LOVE the UWS...Zabar's for one is a few blocks away...Central Park Museums...Park 79 is near so many great restaurants and the subway. Perfect location. 
Robert was great. He took care of us with special requests and small issues in the room were attended to immediately when requested of the front desk. Please note: PEOPLE who stay in NYC Hotels...NEWS FLASH... MOST hotels rooms are small just like the apartments the locals rent monthly. Get over it. How much time do you really expect to spend in the room other than to sleep and bathe? ;) New York City is to explore, not stay in your hotel room.
At Park 79 we stayed three nights in a Deluxe room. Clean room, king bed, and yes, small bathroom (this hotel is over 100 years old) that is functional. 
Again, I can't speak for others, but we were extremely happy with our choice to stay at Park 79 Hotel. The discount made the stay worthwhile as well. We will be back to the city and when we do, we'll stay again at Park 79 Hotel.