Timothée's apartment is lovely. It gets loads of great light, and has a really calm, bright, happy feel to it, especially because of all the great wall colours. We loved the area: The street is quiet, but there's lots of great stuff within a close walk—bars and cafés on Rue Oberkampf and a tiny park just behind the building.
We also walked to the a great market (Bastille), the Marais, Canal St Martin, the Picasso Museum, and Pere Lachaise cemetery. They're all a substantial but very pleasant walk away (the Marais is c.30 mins away and Pere Lachaise 20 mins.)
We visited with a 7-month-old baby and Timothée was welcoming and helpful, responding very quickly and helping with whatever we needed. He was a great host. The apartment was good for a small baby, very clean, cosy and safe; one note is that it's on the 6th floor and the lift only goes to the 5th, but we didn't have much problem carrying the baby up the last flight. Altogether we had a wonderful stay!