The flat has an excellent location, close to a big supermarket, close to the metro station, but the bathroom problem should be solved, we had to spray it 6-7 times every day, and we needed to extend our stay in Paris but we did not try to ask the host if the flat is available for one or two extra nights and we preferred to move out only because of the bathroom smell.
There were other issues like the faulty kettle which wasn't changed and we had to buy one, leaving washing machine and dishwasher detergents enough for two washes only though we booked the flat for 8 nights, these are minor things but I think he will avoid them later on.