I had a great stay. Mathias' apartment is very clean and bright, so beautifully decorated, with views of the Tour Eiffel, and the kitchen has everything needed. The area is very safe and has two regular supermarkets (Franprix and Lidl), the frozen food specialist "Picard", and an organic supermarket ("Biocoop"), and great boulangeries close by. This was important because due to the lockdown, eating in restaurants is not allowed, only takeout.
Just make sure to use the bigger of the two keys provided on the top lock, and you should have a great stay as I did.