This is a very good place for a monthly business stay if you are looking for a place in midtown. I wanted to be very close to Grand Central because of work, and the apartment is only 5-6 minutes walking distance to GC. The place is right on Madison Ave so keep in mind that it will be noisy (because of traffic noise, but this is typical for any main street in midtown).
There were no major issues, but for a few minor questions I had, the management was very responsive and professional. I would stay here again (or I would try other apartments by CRNY as well).
The apartment is old, as many places in midtown are, but it was very clean, had sufficient space, and they did a good job with providing the basic needs (kitchenette with dishes/stove/coffeemaker/etc., towels, hair dryer, and so on).