This was an amazing trip! We stayed at Yannicks flat for 6 days prio6to heading to Nice. The flat is tiny but a great space for two people (was myself and my 15 year old son). Hoping on the metro at the Pyrenees station (train 11) and taking it all the way to the end (Hotel de Ville) will put you right in the center of the Marais. You can also transfer to the number 1 train and go straight to the Louvre. It's a very convenient and safe neighborhood to stay in despite the bad reputation of the 19th arrondissement. If you stay here you absolutely have to try the bakery on the corner! The best pain au chocolate that we had in Paris! Thank you Yannick!