The apartment was very beautiful and stylish but we had a few issues - the biggest one being with the keys and getting in. We were left with 2 sets of keys, neither of which seemed to contain the right key to the outside gate or the main door to the building (we only had the right key for our actual apartment). Luckily we were buzzed in by other tenants each time, but this was extremely stressful for us as we had a small child with us and I was scared we'd be locked out every time we left the house. I contacted our host and he assured me the keys did work and I just had to fiddle with them, but I bumped into the super intendant one morning and she even tried them herself and confirmed they were not he right keys, and also told us this has happened before with out guests.
The unit also wasn't cleaned well, as there was a dirty mop in the bathroom (which I assume was used to clean the floors) and some dirty water drops in the hallway. Again, not ideal when you're traveling with a small child who touches literally everything. There was also some food in the fridge from the previous guests (which wouldn't be a big issue if it was new or unopened), but there was a pack of half eaten olives and some other odds and ends that we had to dispose of.
We also had an issue with the hot water, but after a day we realized there was a switch in one of the bathrooms to reheat the water, though it never seemed to work for the actual shower, only for the bathtub/sinks.
I have never left a poor review, but there were just too many things that resulted in an overall negative experience...