We had an awesome time in Antoine's cosy studio. The metro was just 3 min on foot and Belleville is such a colorful place to live in. Just as you turn left from the studio you find Aux Folie where you can have breakfast and coffee or you can go there after 5pm to see all the artists nearby chatting and having fun. A supermarket is also close and a wine shop with very friendly staff that will make sure you will end up with a wine on your taste is located nearby.
Antoine's place has everything you need except wi-fi (but I find that a plus because sometimes we really need some offline time for ourselfs).
I enjoyed the terrace a lot but bear in mind that it's not usable if the weather is bad.
We would definitely recommend his place for a romantic holiday in Paris.