Issues with hot water supply which resulted in an argument via messages with host. Host suggested we were spending too long in the shower and needed to limit ourselves to a 10-minute shower each which apparently is the average shower time in Paris. Forget enjoying a nice long shower on your holiday. One of us had a cold shower after the other had a 15-minute shower. The next day we both had a quick 5-minute shower each then the hot water supply ran out after 5 minutes. Host managed to arrange for a contractor who only checked the hot water was running again some 4 and half hours later.
Don't forget to read the check-in details. You cannot stay here if you want to arrive late one night and utilise a full day in Paris the next day. Also, if you have a delayed flight or train arrive after 8 PM you will get hit by a €85-€200 surcharge. Fortunately, we managed to arrange for our friend who we were visiting to collect the keys, but not everyone knows someone in Paris. A key box and further check-in details for arrival have been suggested as is the case with most Airbnb's.
There was some noise disturbance into the early hours from one of the neighbours above. I guess this can happen in any apartment though.
Apart from those key points, lovely apartment with very comfortable bedding and an excellent location with a lovely French bakery at the end of the street.