Whilst Belleville a little away from the central arrondisements, the apartment's close proximity to the Metro station made this an excellent base for experiencing the best of Paris - it also means local shops/cafes/etc are significantly cheaper (n.b. there's a good market Tues/Fri).
Annabelle provided good local information at check-in and was available to contact if necessary. The apartment and room are not huge but it's comfortable, quiet at night and the food storage/prep facilities are more than adequate for putting basic meals together (though there are many excellent reasonably priced eating options nearby). I have no hesitation in recommending the room to anyone visiting Paris.