Fortunately, I only stayed for one night. The studio was adequately furnished and clean. However, the reason for the low score is that the door to the room did not fit tightly to the frame, allowing light from the hallway to come through. I could hear the people above me every time they moved around, as well as every conversation on the stairs and landing.
While I'm sure the other apartments in the building are equally nice, the location seemed to attract unsavory characters. From around 10:00 pm, there was a lot of activity in the communal hallway, mostly men entering and leaving the premises. At 2:00 am, a man started shouting, swearing, and banging on the door with some kind of instrument. By 2:30 am, another neighbor asked him to be quiet, and he apologized, albeit with frequent swearing. I called the manager to complain, and by 3:00 am, it finally went quiet. Needless to say, I did not get any sleep and did not feel safe.
Despite the signs in the hallway warning that CCTV cameras were in operation, it seemed they were not monitored, as the manager asked me what was happening. Next time, I will stay in a hotel!