I have never written a bad review for an Airbnb and I don't want this to be all negative, so the positives first:
The location of this apartment is incredible. You are right in the middle of the best neighborhood in the city. It's walkable to the train station, restaurants, museums, shopping, etc.
Now, for the reason we will never stay in this apartment again:
The apartment was extremely warm when we first arrived. I asked if it ever cooled down and was told to keep the window open and it would be fine. Not only did the apartment never cool down but because the window had to remain open we were kept awake till 2/3am every night by the noice of the cafes below. I cannot underscore enough how hot it was in the apartment. We physically could not be in the room during the day and the night was only bearable once the sun had totally gone down. And when I say bearable I mean, strip down because you're gonna sweat through your clothes if you move around too much.
The owner/manager knew this was an issue with the apartment. I understand not having A/C, but install a fan. The room was not livable the way it was.