Hard to find. Even though they say 61, it is actually between 51 and 57 and the building is unlabled with a number. Just go in oaks reception and mail room on the opposite (west) side of foyer. No coffee in apartment bring your own if that is important.
This is a great place to stay, so convenient, good views, comfy bed and choice of pillows. Aircon effective for rooms even though in lounge. I would be happy to stay again now I know where to find it.