We stayed there for 2 nights and everything was good. We arrived late, around midnight. Got in without any problems. I've read about humidity, but it was not so bad as I was expecting. My husband did not like the mattress, was too soft for him. But this is a question of taste :) Pretty good location. Not far from restaurants, but at the same time on a quiet street. Overall, we enjoyed the apartment and our stay!
For late birds, I want to advise a cafe for breakfast, 5 min away from the apartment, in front of the French embassy. It opens at 9 and we had amazing breakfast there!