A very large apartment with lovely high ceilings. Warmed for us on our arrival and was easy to keep warm during our stay. Very comfortable beds and a well stocked kitchen.
The stairwell is a bit shabby and spooky but the children enjoyed the difference between the marble/white steps and the grey rough steps at the top (for the servants originally). Note that there are ~60 steps and no lift.
It was a bit noisy at night but then you're in such a great location that this more than compensates. Earplugs worked well!