We had a lovely stay at Sonia's flat, which is perfectly situated to get around Paris. It's in a great neighbourhood within a short distance walk to Canal St Martin and the Republique area.
One downside: the shower does not have a proper screen, causing the bathroom floor to be all wet every time we were using it. Apart from that, we had a great stay at Sonia's place. It is well decorated, quiet and perfect for a short stay in Paris.