Our arrival was delayed a day after a family member was hospitalised. Jean kindly offered to extend our stay by a day, free of charge. Unfortunately, our return flight to the US was booked and so we couldn't take him up on his offer.
The apartment was clean and the photos of the furnishings are accurate. There are two additional chairs, not shown, in the living area photo. I found the apartment smaller than I expected (wide angle lens?) but it is perfect for a couple. I wouldn't think it would work for 4 adults. It has a sofa bed but there is no door between the living area and bedroom, and the bathroom door doesn't close. The location is great. We walked everywhere, to the Louvre, Cluny, Marais etc. There is a small supermarket around the corner which is well stocked.
There apartment is on the 4th floor (5th floor American) and there is no elevator. There are 75 stairs (18, 15, 21, 21). I would suggest no more than a small carry-on suitcase or backpack to carry up the spiral stairs. The windows are very soundproof when closed. It was cold when we were there. I'm not sure how comfortable it would be to close the windows in the middle of summer.
Jean was very helpful when we asked for an additional key, towels and pillows. He also booked a taxi for our return trip to the airport. We did not meet him and picked the key up from the Italian restaurant next door.
The only suggestion I'd make to improve things would be to get a new set of pots and pans. The non-stick surface is coming off and I wouldn't cook in any of the pots. I made do with a single pan but would have preferred to get more use out of the kitchen. Dishwasher and washing machine worked well.
I have already recommended the apartment to a couple of friends and we would happily stay there again - unless my knees give before then!
If it wasn't for the stairs, I would say 10/10.