Sophie's place is wonderful - a quiet, beautiful courtyard off of the busy street in the heart of Le Marais. The place was comfortable even in the hot Paris summer (95F/35C while we were there). The metro stops are not too far away for someone who doesn't mind a 8-12 minute walk. Great food and shopping in the area.
My wife and I stayed with our 1 year old son, but there was no travel crib available as was listed. Sophie said that she would update this for future users. Merci beaucoup Sophie!