Mery and Pierre were great and although we were arriving late they emailed us all the information we needed to get into the apartment and get settled.
The apartment is in a great location for the metro (15 seconds away from the front door) with easy transport across Paris, and can be walked from Gare du Nord in roughly 5 mins. It's on the 2nd floor (if you're from the UK, else third floor if from elsewhere) which was a little tiring with heavy bags, but once inside the apartment is lovely and better than the photos indicate, with all appliances appearing to be brand new and in a very good decorative state and perfectly neat and tidy
The only slightly unusual observation is that it did rather have the appearance that the owners had just popped out for 5 mins - clothing in cupboards, food in fridge etc and we were a bit unclear what we were able to use and what belonged to them.
Other than that we can't fault it and would happily stay there again.