Lovely little apartment. Clean and well presented. Despite being in a very busy area you don't hear any noise outside. I'm assuming the flat must have soundproofing. Ideal location being only a short walk from Gare du Nord.
Unfortunately our check-in experience wasn't good. The keys need to be picked up from a local shop, who then require a code to unlock the storage box holding the key. We were sent to one shop and then told the keys would be at a different shop. The host wasn't very responsive throughout and sent us the wrong code initially when we got to the second shop. We're experienced travellers but this could have been disconcerting for someone who isn't.
However, once we were checked in, we had a great experience staying at Augustin's place.