We were very pleased with our stay at the Hyatt House / Chelsea. Clean rooms in an excellent location for our visit. 10 minute walk from Penn Station and Madison Square Garden or Macy's. Staff members were very friendly, professional and helpful.
Rooms are small as typical for virtually all hotels in Manhattan and well designed to use the available space efficiently, especially making the bathroom large enough to feel comfortable. In fact, it was large enough that we were able to set up the luggage rack in the bathroom for an extra small suitcase, though we had to move it to use the ironing board. There was a good desk for working as well as a small refrigerator and microwave in our room (so not as fully equipped as some other Hyatt House locations in other cities).
We were lucky to get a room with a great view of the Empire State Building! And high enough that we had no street noise at all.
Breakfast included fresh fruit and freshly made oatmeal, eggs, etc. Highly recommended. The one small problem, which the hotel can't fix, is the long wait for elevators during peak breakfast times. The earlier you go for breakfast, the better.
Another little tip: if you like the iconic $1 pizza in New York for a quick snack (though now priced at $1.50 for cheese and $3-4 with toppings), the small $1 Pizza shop across the street at 832 6th Avenue was actually pretty good! And there is a McDonald's just across 28th Street too. We didn't try any of the other nearby restaurants because other members of our group had preferences in other parts of the city.