The hotel is really nice, charmingly decorated, with great attention to detail. Staff was friendly and helpful, breakfast products were of very high quality (but brunch options - eg omelette - are only available at quite a high price).
The location is great, walking distance to Musée d'Orsay, Louvre, Nôtre Dame, Saint Germain des Près etc, close to the direct RER line to Tour Eiffel.
The only downside of the hotel is that rooms are pretty small and the breakfast room has no windows, but I guess it is the price you pay for such a great location.