Starting with the positives, location was absolutely perfect - located centrally to bars, restaurants, Notre Dame, etc. The unit was also very spacious with 3 beds and a nice, vintage loft design. It was clean and had all the kitchen basics. Beds were comfortable.
However we did have some issues.
The unit was located two floors up and the old wooden staircase to access is narrow, winding and without handrails in one section. It was hard enough for my 80 year old father to navigate as is, but the lights were burned out in the stairwell making it even harder to go up/down. We advised of the burned out lights on Thursday and when we left on Sunday they were still not fixed.
There is an old commercial style elevator that requires a gate be closed to operate, however on two occasions (including when we were checking out) someone on a higher floor had not closed the gate and the elevator was unusable (there were no stairs to the higher floor to close it ourselves). This meant hauling our luggage down the dark/unlit narrow stairs. So do not count on having the elevator available.
Internet reception was dismal, seems it is shared from elsewhere in the building - we could not find a router to try and reboot. The TV in the unit is not a smart TV and there is no cablevision - only option is to stream/cast from you own personal device, but due to the slow internet we could not get that to work after trying daily with several devices. Managed to get Netflix up on the TV screen, but could not actually get anything to play.