Stayed for 2 weeks during a heat wave of 34-35 C. every day for the last week. No a/c but this was in September! As the night temperatures rose, it became unbearable, with no breeze. I'm 74 and needed help. Went down to reception and asked if I could rent a fan, not hoping for much. Immediately they rounded up a tall floor fan and a staff person brought it to my room, no extra charge. From then on it was fine, blowing full blast 24/7 until I checked out.
One other thing--the rooms were very clean, but the first time I turned on the bathroom tap there was a bad smell from the drain--not sure why. Bought scented tea-lights and burned them over 2 nights and the smell faded away.
Third floor overlooking the inner courtyard, very pleasant, but some people, with the windows all open at night, were quite noisy, laughing and talking--but in Paris one puts up with such things!