There are many great attributes to the property. The communications and service in advance and during the stay were fantastic. The location is really convenient for many key areas of the city, the roof deck was very nice (and worked well for connecting the two apartments without having to go through the hall) and the overall building was beautiful.
Below are things to note but not necessarily reasons not to stay in the flat since it's otherwise a good place. The interior design was fun but in some ways less practical than desired. It would be great if there were a freezer in the main unit (ice) and if the glass walled bedroom and bathroom could be closed up together via a door/sliding door so that you could walk from one to the other without going into the publicly visible space while getting ready. That bedroom is also fully in the sun much of the day and the room gets very hot - the air conditioner seemed to overheat during the day and we had to keep reseting it. Hopefully they can fix that.
There is a LOT of noise in the bedrooms if others are awake in the apartment while others sleep - every word comes through, the creaky floors under the dining table make a lot of noise when walked on, etc. - all of which make it difficult for those trying to sleep later or who go to bed earlier than the rest.
The apartment is 5 flights of stairs up at the top of the building and the (charming but small) lift only fits 2 people. It's a fairly slow lift so if everyone needs to take the lift then it's a bit of a wait. If people are okay with the stairs it's a decent climb but definitely doable.
The beds were comfortable enough though it would have been nice to have more than 1 pillow each. There was additional bedding/towels in the wardrobe but no extra pillows.
Otherwise - enjoy the flat and the lovely roof terrace!