Marc's place is located in the heart of Le Marais which we absolutely loved.
It is near by anything and everything that you may need during your stay in Paris. All major sites are located at walking discount of his place.
Also, the metro station and train station is 5 minutes away.
The place was very clean (and I am very particular with that) . Marc was a great host, always reachable and willing to help you with restaurant suggestions, happening events etc during your stay.
We would definitely stay there again.