If you are a light sleeper avoid this place! We stayed for about a week and I woke up every day at 06.30 am as the person living above walked with some kind of clogs, moving chairs and furniture. I complained with Gaia about that, who promptly responded and talked to concierge, but nothing did change. I even spoke with the doormen myself but he wasn't keen to go and speak to the neighbours. Reading through the comments there are some other guests who mentioned this issue.
Waking up in the early hours is not fun when you are on holiday.
Another note, there's a clear musty smell when you get inside the flat.
Location is great, check in and check out was easy and Gaia was very responsive. However, I would never come back to this place!