The apartment was a good find, especially at the price. The rooms and bathrooms were all clean and tidy. The location was good too, as it was close to Republique -- I would avoid the Chateau d'Eau metro area though as it can get a bit dodgy when we exited from there.
Mathilde was very accommodating and quick to reply before and during the reservation. We never met her, but check-in was very easy because you can get access using security codes and lock boxes.
The main issue with the place was with the towels -- they had a damp/mildew smell. We notified Mathilde and she quickly replaced them the next morning (although the problem was still there with the replacement towels). She is aware of the issue, so hoping she will fix them moving forward -- another reviewer should confirm whether that is the case.
I would recommend this place if you want a nice spot close to metros and the restaurants/nightlife near Republique.