I had a lovely one-month stay at Noémie's apartment in Belleville. Noémie was communicative and friendly and responsive. Everything went smoothly. The neighborhood is lively, multicultural, not the typical postcard-Paris neighborhood, which is what I like about it. Still, everything is convenient, and you can experience both romantic Paris and off-the-beaten-path Paris. The apartment itself is quiet and sunny, just as described. It's also pretty spacious for a Paris apartment.

I did suggest to Noémie that the apartment could be more thoroughly cleaned, especially for long-term guests. Depending on your own cleanliness standards, you might ask for specific kinds of cleaning before your stay. That said, I think Noémie has priced her apartment fairly; that extra-thorough cleaning might be something you could offer to pay for if you need it.