Brilliant - STAY HERE!
The apartment could not be in a better location, right in the middle of the Marais - it was spotlessly clean, warm, and extremely comfortable. A small room that has everything you need. Great to have a fridge and microwave so you don't have to eat in restaurants all the time. A few minutes walk to Le Centre Pompidou and Notre Dame, practically opposite Les Philosophes cafe - we could not believe our luck when we arrived, and spent the weekend feeling very smug about our choice of location! The flat is right in the middle of all the shops and bars in the Marais, but totally secluded as you enter through a courtyard so no noise at all from the street - a great night's sleep.
Virginie was the perfect host - so friendly, she welcomed us so warmly and gave us great local advice (there are also a lot of tips on the info sheet in the room). She also rescued us with HUGE grace and generosity when we managed to lock ourselves out and had to disturb her Sunday morning - she could not have been lovelier.
I would have no hesitation at all in recommending this apartment, and would be delighted to stay here again and again.