The apartments are covered by a company called Cove, they manage the apartments and concierge - which were there 24/7. The rooms were amazing, we stayed in a smaller 9th floor studie the first night and a large 3rd floor studio on the 2nd. Rooms were great, fully kitted out, easy intuitive wifi and TV access. Great location, there's a 56th floor lobby/games room that they could give you access to which was stunning.
All in all, would definitely go again and again!