This is a lovely flat for a stay in Paris. It looks out on the canal and as a result it is a pleasant place to spend time and not just a bed for a night. It's within walking distance of Gare du Nord if you are coming on Eurostar and it's a good area with lots of restaurants, cafes and a couple of small supermarkets a minute or so's walk away.
I didn't feel I could give it five stars because we didn't have the greatest check-in experience - we ended up waiting on the pavement outside the building for 45 minutes. I think we were unlucky - there was a metro strike that day - and although we arrived at the time we had told the owner and messaged when we got to Gare du Nord as requested, the owner's friend was delayed and didn't communicate brilliantly (e.g. said he would be there in 10 minutes and then 35 minutes later, there was no sign of him - when I phoned him at that point, he just said he was coming and hung up).