Location, location, location! This studio flat is literally 5 mins walk to the Louvre and 2 mins walk to Chatelet des Halles which is one stop from Gare Du Nord. The flat itself is very modern and, while it is small, the main room is spacious enough for two people for a short period of time. The bed has two proper mattresses - not an uncomfy sofa bed!
Philippe gave us an annotated map of the area with lots of restaurant recommendations and tips of things to see, which was so useful. Thank you!