Our apartment was on the 4th floor. The building itself is very poorly isolated, between floors, walls, etc. Meaning that even if it is 15 degrees Celsius outside, it is 30 degrees inside. Because there is no aircondition, or (de)humidifier, the inside climate was horrible. Furthermore, we could hear anyone on the floor, the floor above and below walking or talking.
The apartment itself is fine, there is room, it is clean, it has what you need. The location is very central, with all that entails in regards to noise.