Alexandre and Mathilde made us feel very welcome. The transit strike was in full force during our scheduled stay, and they helped us understand that it wouldn't disrupt our stay. They let us drop our bags early upon arrival, and gave great recommendations on places to go and eat.
The apartment is very much as advertised. The upstairs master suite is very spacious. The second bedroom upstairs is separated only by glass from the master, so it's not necessarily the most private set up. We opted to stay downstairs in the 3rd bedroom and let our 3 kids stay upstairs, which worked really well. The kitchen is compact but very functional. There were even teabags, sugar and a few snack and food items for us to use.
The apartment was clean, the heater worked very well, and all the rooms were very comfortable. The real star here is the apartment's location. We walked to Ste Chappelle, Musee D'Orsay, Notre Dame and the Marais. Great restaurants nearby - including amazin ramen right across the street - as well as brasseries and Eric Kayser's bakery!!! You can't find a better spot in Paris.
Only one item I'd caution about. If you don't like stairs, this apartment isn't for you. There is a tight spiral staircase that can be a bit treacherous if you are carrying bags or if it's been raining. That said, it shouldn't deter you from this fantastic apartment and wonderful hosts.
We will return!!!
Merci pour tout, Alexandre et Mathilde!