I'll add my 2 cents as well. Chances are the apartments are the same square footage. Not sure which one is the accurate size, but in my building all the apartments in the A, B, C, etc lines are identical. Like Cynthia said, co-ops are usually more restrictive and you'll need to use licensed contractors (major DIY is not allowed.) That being said, many co-ops use a management company to manage the building and can have great recommendations for approved contractors. You'll probably pay a 'premium' compared to other cities since it's NYC and contractors know they can charge more, but given the size of the apartment, the total cost shouldn't be too bad, unless you go crazy with top of the line everything. Plus, you might only need to renovate the kitchen and bath (the hardwood floors look pretty good, at least in the pictures).
A few things to consider, though, when looking at any apartment. What's the view like from the windows? Sounds crazy, but I made sure to have a street view so that no one could build and block my view. I'm glad I did because there's a new building going up next door and apartments down the hall are losing their bathroom window (the new building is probably 5 inches away from ours). Also, think of what floor the apartment is on. Lower levels might get a lot of street noise (I'm on the 4th floor and the noise isn't bad, at least for me.) If there's a power outage or elevator renovation, how are you at walking up many flights of stairs with groceries? The 7th floor wouldn't be too bad, but I have friends who didn't think of that and bought 20th floor apartments. They weren't happy when Sandy hit and had no power.
Hope that helps! :-)