Me and my wife spent four nights in Julie's and Paul-Alain's apartment. It is situated near Canal Saint-Martin in 10th arrondissement that must be one of the most enchanting neighbourhoods in Paris. There are lots of welcoming cafés and restaurants and interesting speciality shops. No tourist crowds. Hundreds of locals sitting by the canal in the evening. It must be like Latin Quarter was at 1920s - lively, local, exciting, improvising.
The apartment is very cosy. Paul-Alain and Julie like travelling and photographing and the apartment reflects nicely their explorers' way of life. (Nice record collection, too.) We slept soundly, it was silent during nights. Only suggestion for improvement is wi-fi: the connection was very slow and many times there was no connection at all - it was very difficult to try to reserve museum tickets, check transport timetables etc. by wi-fi.
It is only 5 minutes walk to Gare de l'Est and metro and under 15 minutes to Gare du Nord. If you like to promenade in Paris it's only two kilometres to Marais and Pompidou and 2,5 to Louvre. And to the opposite direction there is one of Paris's most beautiful park Buttes-Chaumont only a kilometre and half away, a perfect place to spend a while and have a picnic ( a canalside is another perfect place for picnic, and nearer - but don't miss Buttes-Chaumont, it is really beautiful and original).
Thank you Julie and Paul-Alain for your hospitality. It was our first time in 10th arrondissement, but certainly not the last.