Carolyn's place is great. We had an event at the Javits Convention Center, and we also had some holiday time. Carolyn's place was perfect location - we walked to the Convention center each day of the event. Carolyn's place is also close enough to walk to math museum and plenty of shopping and dining. Central Park and Lower East Side were just short cab rides away. There is also a great gourmet grocery store 2 blocks away, called Brooklyn Fare. Having the washer/dryer in Carolyn's unit definitely made it easier for us - we did not have to pack as many clothes, and when we arrived home we did not have a huge pile of laundry to do. Rosa and Emilio (on-site personnel) were very friendly and helpful as well.
A few minor down-sides: (i) There is only A/C unit in the main living area, so had to leave bedroom doors open at night to stay cool. (ii) Nothing Carolyn can do about this, but there were a couple of residents in the building 1 or 2 floors above Carolyn. On the weekend, they would come home really late, and were extremely loud in the stairwell.
Overall, a wonderful apartment -- next time we are in NYC we will definitely try to book Carolyn's place again!