I have stayed with Rahul and Susham for 7 weeks. I recommend spending time to learn about this lovely couple and their culture as this experience turned out for me a great value added to my stay in New York. I loved every conversation we had.
The appartment is located next to Columbia University. 6 minutes away by foot from subway (pretty walk through Columbia campus). Perfect location. It is a place where your hosts live with you on daily basis. If you do not mind sharing your space with other people (living room, kitchen, bathroom) - this is a great spot for your vacation in New York.