This apartment is a gem. If you are lucky enough to find it available, book it. It was very spacious and comfortable by NYC standards, very well furnished and organized, and it was immaculate. The Upper West Side is one of NY's great neighborhoods, and the location of the apartment is ideal - a block away from the subway, and a short walk to Zabar's, Citarella, Fairway, etc. There is an abundance of very good restaurants and cafes in the neighborhood. You also have Riverside Park and Central Park quite close by.
I have to make a special mention of Andrew, who was our host. He was responsive, helpful, and clearly wanted us to enjoy the apartment and the surrounding area. It was like dealing with an old friend.
I would stay here again without hesitation.