Our family of four (ages 13, 15, 51 and 61) stayed in the "Charmful flat" for 5 days in the middle of July. The weather was warm (max about 30 degrees C most days).
We maintained good contact with us prior to our stay and was there to meet us when we arrived. She was very helpful in showing us around the flat and in providing tips about where to go and what to see.
The flat itself is just as it is shown on the website. The stairs were a bit of a challenge (especially with luggage), but none of us found them a real hindrance. The nights were warm, but we still managed to sleep OK. If you have the windows open you can get some nice airflow and then you get the background buzz from the square bubbling up to the flat. Even then, the bedrooms are still reasonably quiet. We rather enjoyed listening to the sounds from the square - it added to the atmosphere.
The living space was perfectly adequate for the four of us.
You can't beat the location. It is right in the heart of the old city and it was a short walk to the metro, literally a stone's throw to the Saone, there is a reasonably well equipped supermarket at the end of the square and the choice of hundreds of places to eat and drink.
To top off our stay, Bastille Day celebrations meant we saw the fireworks display lighting up the Basillica on the hill above us.
All seen from the living room windows!
Thanks Cecile