We thoroughly enjoyed our 2 weeks in November here!
The location is amazing - for example, we could walk to a different bakery or patisserie each day during our visit. The Louvre, Les Marais district, Notre Dame, Rue Montorgueil, Forum des Halles, etc., etc., etc., were all within a mile / 20 minutes walk. Oh, and a couple playgrounds were within about a quarter mile (Jardin Anne Frank, as well as the one in front of Musée des Arts et Métiers). Plus, it's right next to the 4 subway line and others (including RER, for those Disneyland or Versailles daytrips) are less than 10 minutes away.
Even though temperatures outside dipped down below freezing, we were comfy warm inside throughout our visit.
We found most everything we needed in the unit (an earlier review mentioned missing wine glasses - but the kitchen had those for us) and anything we needed could be easily acquired at the Monoprix (supermarket) next door.
As a minor note, there was some active construction next door during our visit during daytime hours - if you plan to be in the unit extensively, you might inquire into whether that is still ongoing.
Finally, check-in was super easy, Alex&Ece were even able to accommodate an early check-in, within minutes of when we arrived all jet lagged from the airport.
Thanks again!