I stayed at this apartment for 8 nights at the end of November/ early December. The apartment is lovely. It is a good size, very clean and modern, and the bathroom is nice and large. It is also in a great location, very close to Madison and 5th Avenue (for shopping). There are also some great restaurants that are very close - Chin Chin (great Chinese place), and Smith & Wollensky (awesome steak house!) The booking process is also very efficient as this property is managed by a company.
The negatives of this apartment are that it is on a very busy street, so extremely loud during the day and especially at night, also the bedding that is included is AWFUL. The mattress is a wide mattress, and the sheets are meant for a regular one, so keep slipping off at night - I complained about this the first night I got there, and was really disappointed that it took them almost 4 days to get me new sheets - and even then, they were the wrong ones. Also the mattress protector was completely torn, and also too small for the mattress.... I didn't complain about this because it took them so long to get me the wrong bedsheets, that I didn't think it was worth my time.
Overall, my stay was good... My one suggestion is to upgrade the bedding... for this price, the bedding provided should be better quality.