This really is a great apartment. It's spotlessly clean, and fitted out to a very high standard.
The living room is spacious, the bed is comfortable, and the air conditioning works well.
As others have mentioned, the apartment is situated in a very busy area. However the combination of the double-glazed windows and the stylish wooden shutters keeps most noise out. In the mid-evening, we could certainly hear the music from the rooftop terrace bar opposite, but that finished before we wanted to sleep, so it was not a problem.
Collecting the keys from the nearby Welcome Centre was reasonably straightforward. Although I suspect that if you wanted to check in late, it would be more awkward (probably collection a further distance away).
Communication was good for the most part, with detailed emails and online information about how to operate absolutely everything in the apartment. However it was let down by some apparent miscommunication over where to leave the keys on check-out -- we were told by email, and by the person in the Welcome Centre, to just leave the keys on the table in the apartment when we checked out. However, even though we did exactly that, we still received a panicked message later that afternoon asking where we had left the keys as they could not enter the apartment. This was not really a problem for us, but it did indicate an inconsistency within the management of the property, which is slightly concerning.
However this was only a tiny wrinkle. Overall we had a great stay in this apartment, and I would highly recommend it.