Sandy is a great host and did all what she could to make me feel comfortable. The room was as described and I loved its space and its privacy though I did not like the heavy sound of the A/C, but fortunately I did not have to use it much. The location is fantastic with plenty of boutiques, few mom and pop that are still surviving the Upper West Side transformation and great grocery places to take care of the daily routine.
Overall I recommend Sandy's apartment especially for those who are tourist and want to discover every corner of New York City while having a relaxing place to come back to at the end of the day.